Link with OpenCL by default and expose GNU extensions. (#80) #324

Job	Run time
lint / build	8s
build_linux / build (single, x86_64)	7m 29s
build_android / build (single, arm64)	6m 32s
build_linux / build (double, x86_64)	7m 42s
build_android / build (single, arm32)	6m 27s
build_android / build (single, x86_64)	6m 58s
build_macos / build (single, universal)	6m 49s
build_android / build (single, x86_32)	6m 31s
build_web / build (single, wasm32)	10m 21s
build_macos / build (double, .double, universal)	7m 8s
build_android / build (double, arm64)	7m 29s
build_windows / build (single, x86_32, Win32)	11m 15s
build_web / build (double, wasm32)	10m 24s
build_android / build (double, arm32)	6m 38s
build_windows / build (single, x86_64, x64)	11m 36s
build_android / build (double, x86_64)	6m 32s
build_windows / build (double, x86_32, Win32)	12m 9s
build_android / build (double, x86_32)	6m 34s
build_windows / build (double, x86_64, x64)	10m 28s
build_ios / build (single, arm64)	3m 59s
build_ios / build (double, arm64, .double)	4m 9s
Create Release / release	33s
	2h 37m 51s

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