CMake

Add extension iterator. #624

Job	Run time
CMake/Android/So/ARMv8/Release	18s
CMake/Android/So/X86/Release	20s
Test build with CMake 3.16.0	1m 8s
CMake MINGW	43s
CMake/Android/So/X64/Release	16s
CMake/Windows/Dll/X86/Release	2m 0s
CMake/Windows/Dll/X64/Release	1m 29s
CMake/Windows/Dll/ARMv8/Release	2m 16s
CMake/Linux/So/X64/Release	25s
CMake/MacOSX/So/X64/Release	28s
CMake/MacOSX/Framework/X64/Release	1m 15s
CMake/iOS/Dll/arm64/Release	32s
CMake/iOS/Framework/arm64/Release	36s
CMake/Windows/Lib/X86/Release	2m 4s
CMake/Windows/Lib/X64/Release	2m 15s
CMake/Windows/Lib/armv8/Release	1m 19s
CMake/Linux/Lib/X64/Release	56s
CMake/MacOSX/Lib/X64/Release	1m 14s
CMake/iOS/Lib/arm64/Release	31s
CMake/Android/Lib/ARMv8/Release	20s
CMake/Android/Lib/X86/Release	1m 20s
CMake/Android/Lib/X64/Release	1m 3s
CMake/CustomModes/Linux/Lib/X64/Release	1m 6s
CMake/AssertionsFuzz/Windows/Lib/X64/Release	1m 59s
CMake/AssertionsFuzz/Linux/Lib/X64/Release	1m 5s
CMake/AssertionsFuzz/MacOSX/Lib/X64/Release	1m 32s
	28m 30s

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