CMake

Fix d330ccea: 1/8 bit headroom in cubic bit alloc #702

Job	Run time
CMake/Android/So/ARMv8/Release	22s
CMake/Android/So/X86/Release	21s
CMake/Android/So/X64/Release	47s
CMake MINGW	56s
CMake/Windows/Dll/X86/Release	1m 35s
Test build with CMake 3.16.0	1m 14s
CMake/Windows/Dll/X64/Release	1m 58s
CMake/Windows/Dll/ARMv8/Release	1m 45s
CMake/Linux/So/X64/Release	29s
CMake/MacOSX/So/X64/Release	32s
CMake/MacOSX/Framework/X64/Release	1m 15s
CMake/iOS/Dll/arm64/Release	31s
CMake/iOS/Framework/arm64/Release	36s
CMake/Windows/Lib/X86/Release	2m 20s
CMake/Windows/Lib/X64/Release	2m 1s
CMake/Windows/Lib/armv8/Release	1m 43s
CMake/Linux/Lib/X64/Release	1m 0s
CMake/MacOSX/Lib/X64/Release	1m 43s
CMake/iOS/Lib/arm64/Release	39s
CMake/Android/Lib/ARMv8/Release	50s
CMake/Android/Lib/X86/Release	43s
CMake/Android/Lib/X64/Release	47s
CMake/CustomModes/Linux/Lib/X64/Release	1m 41s
CMake/AssertionsFuzz/Windows/Lib/X64/Release	2m 58s
CMake/AssertionsFuzz/Linux/Lib/X64/Release	1m 29s
CMake/AssertionsFuzz/MacOSX/Lib/X64/Release	1m 59s
	32m 14s

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