CMake

Improve extension generator buffer too small test. #74

Job	Run time
Test build with CMake 3.16.0	1m 4s
CMake MINGW	41s
CMake/Android/So/ARMv8/Release	21s
CMake/Android/So/X86/Release	27s
CMake/Android/So/X64/Release	39s
CMake/Windows/Dll/X86/Release	1m 53s
CMake/Windows/Dll/X64/Release	2m 58s
CMake/Windows/Dll/ARMv8/Release	1m 45s
CMake/Linux/So/X64/Release	25s
CMake/MacOSX/So/X64/Release	35s
CMake/MacOSX/Framework/X64/Release	1m 26s
CMake/iOS/Dll/arm64/Release	42s
CMake/iOS/Framework/arm64/Release	40s
CMake/Windows/Lib/X86/Release	2m 26s
CMake/Windows/Lib/X64/Release	2m 20s
CMake/Windows/Lib/armv8/Release	1m 27s
CMake/Linux/Lib/X64/Release	56s
CMake/MacOSX/Lib/X64/Release	1m 38s
CMake/iOS/Lib/arm64/Release	39s
CMake/Android/Lib/ARMv8/Release	47s
CMake/Android/Lib/X86/Release	41s
CMake/Android/Lib/X64/Release	39s
CMake/CustomModes/Linux/Lib/X64/Release	1m 7s
CMake/AssertionsFuzz/Windows/Lib/X64/Release	2m 46s
CMake/AssertionsFuzz/Linux/Lib/X64/Release	1m 1s
CMake/AssertionsFuzz/MacOSX/Lib/X64/Release	1m 18s
	31m 21s

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