Merge pull request #1172 from cdavis5e/fix-xc11-compilation

MVKImage: Fix compilation with Xcode 11.
diff --git a/MoltenVK/MoltenVK/GPUObjects/MVKImage.mm b/MoltenVK/MoltenVK/GPUObjects/MVKImage.mm
index 35bd99e..16771af 100644
--- a/MoltenVK/MoltenVK/GPUObjects/MVKImage.mm
+++ b/MoltenVK/MoltenVK/GPUObjects/MVKImage.mm
@@ -1669,7 +1669,7 @@
 
 		switch (mtlPixFmt) {
 			case MTLPixelFormatR8Unorm:
-#ifndef MTLPixelFormatR8Unorm_sRGB
+#if MVK_MACOS_APPLE_SILICON || MVK_IOS_OR_TVOS
 			case MTLPixelFormatR8Unorm_sRGB:
 #endif
 			case MTLPixelFormatR8Snorm:
@@ -1689,7 +1689,7 @@
 				break;
 
 			case MTLPixelFormatRG8Unorm:
-#ifndef MTLPixelFormatRG8Unorm_sRGB
+#if MVK_MACOS_APPLE_SILICON || MVK_IOS_OR_TVOS
 			case MTLPixelFormatRG8Unorm_sRGB:
 #endif
 			case MTLPixelFormatRG8Snorm: