[quartzcomposer] Update for Xcode 11 beta 1 (#6752)

No other change in b2 to b5

src/quartzcomposer.cs

@@ -34,6 +34,7 @@ using CoreVideo;
 
 namespace QuartzComposer {
 
+	[Deprecated (PlatformName.MacOSX, 10,15)]
 	[BaseType (typeof (NSObject))]
 	interface QCComposition : NSCopying {
 		[Static]
@@ -193,6 +194,7 @@ namespace QuartzComposer {
 
 	}
 
+	[Deprecated (PlatformName.MacOSX, 10,15)]
 	[BaseType (typeof (NSObject))]
 	[DisableDefaultCtor] // crash when used (e.g. description) meant to be used thru sharedCompositionRepository
 	interface QCCompositionRepository {

tests/xtro-sharpie/macOS-QuartzComposer.todo

@@ -1,2 +0,0 @@
-!deprecated-attribute-missing! QCComposition missing a [Deprecated] attribute
-!deprecated-attribute-missing! QCCompositionRepository missing a [Deprecated] attribute