Added metal availability attributes

Author: DeltaW0x

src/gpu/metal/SDL_gpu_metal.m

@@ -515,7 +515,7 @@ static MTLDepthClipMode SDLToMetal_DepthClipMode(
 
 typedef struct MetalPipelineCache
 {
-    id<MTLBinaryArchive> pipelineCache;
+    @available(macOS 11.0, iOS 14.0, tvOS 14.0, *) id<MTLBinaryArchive> pipelineCache;
     size_t checksumSize;
     void* checksumData;
     size_t cacheBlobSize;
@@ -1120,7 +1120,7 @@ static void METAL_ReleasePipelineCache(
         pipelineDescriptor = [MTLRenderPipelineDescriptor new];
 
         /*
-        if(@available(macOS 11.0, *))
+        if(@available(macOS 11.0, iOS 14.0, tvOS 14.0, *))
         {
             if(pipelineCache->pipelineCache != nil)
             {
@@ -1217,7 +1217,7 @@ static void METAL_ReleasePipelineCache(
         }
 
         /*
-        if(@available(macOS 11.0, *))
+        if(@available(macOS 11.0, iOS 14.0, tvOS 14.0, *))
         {
             if(pipelineCache != NULL){
                 [pipelineCache->pipelineCache addRenderPipelineFunctionsWithDescriptor:pipelineDescriptor error:&error];
@@ -1260,7 +1260,7 @@ static void METAL_ReleasePipelineCache(
 {
     // Implementing it is easy, but there's not way to get the binary data out of MTLBinaryArchive without bouncing it to a file first
     /*
-    if(@available(macOS 11.0, *)){
+    if(@available(macOS 11.0, iOS 14.0, tvOS 14.0, *)){
         @autoreleasepool {
             MetalRenderer* renderer = (MetalRenderer*)driverData;
             MetalPipelineCache* pipelineCache = (MetalPipelineCache*)SDL_malloc(sizeof(MetalPipelineCache));