Enable proguard for BuildAll

samples/BuildAll/BuildAll/BuildAll.csproj

@@ -24,6 +24,8 @@
     <MonoAndroidAssetsPrefix>Assets</MonoAndroidAssetsPrefix>
     <AndroidEnableSGenConcurrent>true</AndroidEnableSGenConcurrent>
     <AndroidHttpClientHandlerType>Xamarin.Android.Net.AndroidClientHandler</AndroidHttpClientHandlerType>
+    <EnableProguard>true</EnableProguard>
+    <AndroidEnableMultiDex>true</AndroidEnableMultiDex>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>True</DebugSymbols>
@@ -37,7 +39,6 @@
     <AndroidLinkMode>None</AndroidLinkMode>
     <EmbedAssembliesIntoApk>False</EmbedAssembliesIntoApk>
     <MandroidI18n />
-    <AndroidEnableMultiDex>true</AndroidEnableMultiDex>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugSymbols>True</DebugSymbols>
@@ -51,7 +52,6 @@
     <AndroidUseSharedRuntime>False</AndroidUseSharedRuntime>
     <AndroidLinkMode>SdkOnly</AndroidLinkMode>
     <EmbedAssembliesIntoApk>True</EmbedAssembliesIntoApk>
-    <AndroidEnableMultiDex>true</AndroidEnableMultiDex>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="System" />