[msbuild] Share the Pack/UnpackLibraryResources targets between Xamarin.iOS and Xamarin.Mac. (#9471)

There were 2 differences that had to be reconciled:

* The Xamarin.Mac version took 'IntermediateOutputPath' as the intermediate
  output path, while the Xamarin.iOS version used
  'DeviceSpecificIntermediateOutputPath'.
  'DeviceSpecificIntermediateOutputPath' is defined to be
  'IntermediateOutputPath' for Xamarin.Mac, so make the shared version use
  'DeviceSpecificIntermediateOutputPath', since that works in both cases.

* The Xamarin.Mac version was writing the output of PackLibraryResources to
  the FileWrites item group. This was removed on purpose from the Xamarin.iOS
  version in e97d69b25c, so it seemed best to
  leave it out in the shared version as well.

Also re-use the _EmbeddedResourcePrefix variable to determine the resource prefix.

msbuild/Xamarin.Mac.Tasks/Xamarin.Mac.Common.targets

@@ -274,30 +274,6 @@ Copyright (C) 2014 Xamarin. All rights reserved.
 		</CreateInstallerPackage>
 	</Target>
 
-	<Target Name="_PackLibraryResources" Condition="'$(_CanOutputAppBundle)' == 'false'" DependsOnTargets="_CollectBundleResources">
-		<PackLibraryResources
-			Condition="'$(IsMacEnabled)' == 'true'"
-			SessionId="$(BuildSessionId)"
-			Prefix="xammac"
-			BundleResourcesWithLogicalNames="@(_BundleResourceWithLogicalName)">
-			<Output TaskParameter="EmbeddedResources" ItemName="EmbeddedResource" />
-		</PackLibraryResources>
-	</Target>
-
-	<Target Name="_UnpackLibraryResources" Condition="'$(_CanOutputAppBundle)' == 'true'" DependsOnTargets="ResolveReferences;_CollectBundleResources">
-		<UnpackLibraryResources
-			Condition="'$(IsMacEnabled)' == 'true'"
-			SessionId="$(BuildSessionId)"
-			Prefix="xammac"
-			NoOverwrite="@(_BundleResourceWithLogicalName)"
-			IntermediateOutputPath="$(IntermediateOutputPath)"
-			TargetFrameworkDirectory="$(TargetFrameworkDirectory)"
-			ReferencedLibraries="@(ReferencePath)">
-			<Output TaskParameter="BundleResourcesWithLogicalNames" ItemName="_BundleResourceWithLogicalName" />
-			<Output TaskParameter="BundleResourcesWithLogicalNames" ItemName="FileWrites" />
-		</UnpackLibraryResources>
-	</Target>
-
 	<Target Name="_GenerateBundleName">
 		<PropertyGroup>
 			<AppBundleDir>$(OutputPath)$(_AppBundleName)$(AppBundleExtension)</AppBundleDir>

msbuild/Xamarin.Shared/Xamarin.Shared.ObjCBinding.targets

@@ -53,10 +53,6 @@ Copyright (C) 2020 Microsoft. All rights reserved.
 	</Target>
 
 	<Target Name="_CreateEmbeddedResources" DependsOnTargets="_CollectBundleResources">
-		<PropertyGroup>
-			<_EmbeddedResourcePrefix Condition="'$(_PlatformName)' == 'macOS'">xammac</_EmbeddedResourcePrefix>
-			<_EmbeddedResourcePrefix Condition="'$(_PlatformName)' != 'macOS'">monotouch</_EmbeddedResourcePrefix>
-		</PropertyGroup>
 		<CreateEmbeddedResources BundleResources="@(_BundleResourceWithLogicalName)" Prefix="$(_EmbeddedResourcePrefix)">
 			<Output ItemName="EmbeddedResource" TaskParameter="EmbeddedResources" />
 		</CreateEmbeddedResources>

msbuild/Xamarin.Shared/Xamarin.Shared.props

@@ -204,6 +204,10 @@ Copyright (C) 2020 Microsoft. All rights reserved.
 		<!-- EnableOnDemandResources: default to true for Xamarin.iOS and false for Xamarin.Mac -->
 		<EnableOnDemandResources Condition="'$(_PlatformName)' == 'macOS' And '$(EnableOnDemandResources)' == ''">false</EnableOnDemandResources>
 		<EnableOnDemandResources Condition="'$(_PlatformName)' != 'macOS' And '$(EnableOnDemandResources)' == ''">true</EnableOnDemandResources>
+
+		<!-- This is the prefix used for embedded resources, both for library projects and binding projects -->
+		<_EmbeddedResourcePrefix Condition="'$(_PlatformName)' == 'macOS'">xammac</_EmbeddedResourcePrefix>
+		<_EmbeddedResourcePrefix Condition="'$(_PlatformName)' != 'macOS'">monotouch</_EmbeddedResourcePrefix>
 	</PropertyGroup>
 
 	<PropertyGroup Condition="'$(IsBindingProject)' == 'true'">

msbuild/Xamarin.Shared/Xamarin.Shared.targets

@@ -519,6 +519,29 @@ Copyright (C) 2018 Microsoft. All rights reserved.
 		</DetectSdkLocations>
 	</Target>
 
+	<Target Name="_PackLibraryResources" Condition="'$(_CanOutputAppBundle)' == 'false'" DependsOnTargets="_CollectBundleResources">
+		<PackLibraryResources
+			Condition="'$(IsMacEnabled)' == 'true'"
+			SessionId="$(BuildSessionId)"
+			Prefix="$(_EmbeddedResourcePrefix)"
+			BundleResourcesWithLogicalNames="@(_BundleResourceWithLogicalName)">
+			<Output TaskParameter="EmbeddedResources" ItemName="EmbeddedResource" />
+		</PackLibraryResources>
+	</Target>
+
+	<Target Name="_UnpackLibraryResources" Condition="'$(_CanOutputAppBundle)' == 'true'" DependsOnTargets="ResolveReferences;_CollectBundleResources">
+		<UnpackLibraryResources
+			Condition="'$(IsMacEnabled)' == 'true'"
+			SessionId="$(BuildSessionId)"
+			Prefix="$(_EmbeddedResourcePrefix)"
+			NoOverwrite="@(_BundleResourceWithLogicalName)"
+			IntermediateOutputPath="$(DeviceSpecificIntermediateOutputPath)"
+			TargetFrameworkDirectory="$(TargetFrameworkDirectory)"
+			ReferencedLibraries="@(ReferencePath);@(ReferenceDependencyPaths)">
+			<Output TaskParameter="BundleResourcesWithLogicalNames" ItemName="_BundleResourceWithLogicalName" />
+		</UnpackLibraryResources>
+	</Target>
+
 	<Target Name="_ParseBundlerArguments">
 		<ParseBundlerArguments
 			ExtraArgs="$(_BundlerArguments)"

msbuild/Xamarin.iOS.Tasks.Core/Xamarin.iOS.Common.targets

@@ -359,29 +359,6 @@ Copyright (C) 2013-2016 Xamarin. All rights reserved.
 		</MetalLib>
 	</Target>
 
-	<Target Name="_PackLibraryResources" Condition="'$(_CanOutputAppBundle)' == 'false'" DependsOnTargets="_CollectBundleResources">
-		<PackLibraryResources
-			SessionId="$(BuildSessionId)"
-			Condition="'$(IsMacEnabled)' == 'true'"
-			Prefix="monotouch"
-			BundleResourcesWithLogicalNames="@(_BundleResourceWithLogicalName)">
-			<Output TaskParameter="EmbeddedResources" ItemName="EmbeddedResource" />
-		</PackLibraryResources>
-	</Target>
-
-	<Target Name="_UnpackLibraryResources" Condition="'$(_CanOutputAppBundle)' == 'true'" DependsOnTargets="ResolveReferences;_CollectBundleResources">
-		<UnpackLibraryResources
-			SessionId="$(BuildSessionId)"
-			Condition="'$(IsMacEnabled)' == 'true'"
-			Prefix="monotouch"
-			NoOverwrite="@(_BundleResourceWithLogicalName)"
-			IntermediateOutputPath="$(DeviceSpecificIntermediateOutputPath)"
-			TargetFrameworkDirectory="$(TargetFrameworkDirectory)"
-			ReferencedLibraries="@(ReferencePath);@(ReferenceDependencyPaths)">
-			<Output TaskParameter="BundleResourcesWithLogicalNames" ItemName="_BundleResourceWithLogicalName" />
-		</UnpackLibraryResources>
-	</Target>
-
 	<Target Name="_GenerateBundleName" Condition="'$(_CanOutputAppBundle)' == 'true'" DependsOnTargets="_ComputeTargetArchitectures;_GenerateAppBundleName;_GenerateAppExBundleName">
 		<PropertyGroup>
 			<_AppResourcesPath>$(_AppBundlePath)</_AppResourcesPath>