GPU: Remove uneeded and incorrect os version check

Theses added checks are not working correctly and
are never true even on supported hardware with correct
target version.

source/blender/gpu/metal/mtl_framebuffer.mm

@@ -1562,7 +1562,6 @@ MTLRenderPassDescriptor *MTLFrameBuffer::bake_render_pass_descriptor(bool load_c
       framebuffer_descriptor_[descriptor_config] = [[MTLRenderPassDescriptor alloc] init];
     }
 
-#if defined(MAC_OS_X_VERSION_11_0) && __MAC_OS_X_VERSION_MAX_ALLOWED > MAC_OS_X_VERSION_11_0
     if (@available(macOS 11.00, *)) {
       /* Optimization: Use smaller tile size on Apple Silicon if exceeding a certain bpp limit. */
       bool is_tile_based_gpu = [metal_ctx->device hasUnifiedMemory];
@@ -1576,7 +1575,6 @@ MTLRenderPassDescriptor *MTLFrameBuffer::bake_render_pass_descriptor(bool load_c
         }
       }
     }
-#endif
 
     /* Configure multilayered rendering. */
     if (use_multilayered_rendering_) {

source/blender/gpu/metal/mtl_shader.mm

@@ -292,7 +292,6 @@ bool MTLShader::finalize(const shader::ShaderCreateInfo *info)
     options.languageVersion = MTLLanguageVersion2_2;
     options.fastMathEnabled = YES;
 
-#if defined(MAC_OS_X_VERSION_11_0) && __MAC_OS_X_VERSION_MAX_ALLOWED > MAC_OS_X_VERSION_11_0
     if (@available(macOS 11.00, *)) {
       /* Raster order groups for tile data in struct require Metal 2.3.
        * Retaining Metal 2.2. for old shaders to maintain backwards
@@ -301,7 +300,6 @@ bool MTLShader::finalize(const shader::ShaderCreateInfo *info)
         options.languageVersion = MTLLanguageVersion2_3;
       }
     }
-#endif
 
     NSString *source_to_compile = shd_builder_->msl_source_vert_;
 

source/blender/gpu/metal/mtl_texture.mm

@@ -2138,13 +2138,12 @@ void gpu::MTLTexture::ensure_baked()
 
     /* Override storage mode if memoryless attachments are being used. */
     if (gpu_image_usage_flags_ & GPU_TEXTURE_USAGE_MEMORYLESS) {
-#if defined(MAC_OS_X_VERSION_11_0) && __MAC_OS_X_VERSION_MAX_ALLOWED > MAC_OS_X_VERSION_11_0
       if (@available(macOS 11.00, *)) {
         texture_descriptor_.storageMode = MTLStorageModeMemoryless;
       }
-#else
-      BLI_assert_msg(0, "GPU_TEXTURE_USAGE_MEMORYLESS is not available on older MacOS versions");
-#endif
+      else {
+        BLI_assert_msg(0, "GPU_TEXTURE_USAGE_MEMORYLESS is not available on older MacOS versions");
+      }
     }
 
     /* Standard texture allocation. */