CMake

Merge branch 'xiph:main' into main #3

Job	Run time
CMake MINGW	42s
Test build with CMake 3.16.0	1m 8s
CMake/Android/So/ARMv8/Release	33s
CMake/Android/So/X86/Release	32s
CMake/Windows/Dll/X64/Release	1m 2s
CMake/Windows/Dll/X86/Release	1m 23s
CMake/iOS/Dll/arm64/Release	48s
CMake/MacOSX/Lib/X64/Release	1m 37s
CMake/Windows/Lib/armv8/Release	59s
CMake/Windows/Dll/ARMv8/Release	1m 29s
CMake/Linux/Lib/X64/Release	1m 18s
CMake/Linux/So/X64/Release	32s
CMake/MacOSX/Framework/X64/Release	1m 22s
CMake/MacOSX/So/X64/Release	53s
CMake/iOS/Framework/arm64/Release	57s
CMake/Windows/Lib/X86/Release	2m 51s
CMake/CustomModes/Linux/Lib/X64/Release	1m 22s
CMake/Android/So/X64/Release	36s
CMake/Android/Lib/ARMv8/Release	39s
CMake/AssertionsFuzz/MacOSX/Lib/X64/Release	1m 28s
CMake/iOS/Lib/arm64/Release	54s
CMake/Android/Lib/X64/Release	33s
CMake/AssertionsFuzz/Linux/Lib/X64/Release	1m 21s
CMake/AssertionsFuzz/Windows/Lib/X64/Release	2m 32s
CMake/Windows/Lib/X64/Release	2m 35s
CMake/Android/Lib/X86/Release	42s
	30m 48s

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