GPU (macOS): silence compiler warnings

Author: CarterLi

src/detection/gpu/gpu_apple.m

@@ -60,10 +60,13 @@
             else if ([device supportsFeatureSet:MTLFeatureSet_macOS_GPUFamily1_v1])
                 ffStrbufSetStatic(&gpu->platformApi, "Metal Feature Set 1");
             #else // MAC_OS_X_VERSION_10_15
+            #pragma clang diagnostic push
+            #pragma clang diagnostic ignored "-Wunguarded-availability-new"
             if ([device supportsFamily:MTLGPUFamilyMetal4])
                 ffStrbufSetStatic(&gpu->platformApi, "Metal 4");
             else if ([device supportsFamily:MTLGPUFamilyMetal3])
                 ffStrbufSetStatic(&gpu->platformApi, "Metal 3");
+            #pragma clang diagnostic pop
             else if ([device supportsFamily:MTLGPUFamilyCommon3])
                 ffStrbufSetStatic(&gpu->platformApi, "Metal Common 3");
             else if ([device supportsFamily:MTLGPUFamilyCommon2])