fix arm asm meson source build #545

Job	Run time
CMake/Android/So/ARMv8/Release	39s
CMake MINGW	1m 23s
CMake/Android/So/X86/Release	38s
CMake/Android/So/X64/Release	29s
CMake/Windows/Dll/X86/Release	1m 30s
Test build with CMake 3.1.0	1m 28s
CMake/Windows/Dll/X64/Release	1m 38s
CMake/Windows/Dll/ARMv8/Release	1m 38s
CMake/Linux/So/X64/Release	43s
CMake/MacOSX/So/X64/Release	7m 2s
CMake/MacOSX/Framework/X64/Release	1m 20s
CMake/iOS/Dll/arm64/Release	53s
CMake/iOS/Framework/arm64/Release	1m 20s
CMake/Windows/Lib/X86/Release	2m 24s
CMake/Windows/Lib/X64/Release	2m 32s
CMake/Windows/Lib/armv8/Release	1m 28s
CMake/Linux/Lib/X64/Release	1m 48s
CMake/MacOSX/Lib/X64/Release	1m 21s
CMake/iOS/Lib/arm64/Release	52s
CMake/Android/Lib/ARMv8/Release	1m 24s
CMake/Android/Lib/X86/Release	48s
CMake/Android/Lib/X64/Release	50s
CMake/CustomModes/Linux/Lib/X64/Release	1m 4s
CMake/AssertionsFuzz/Windows/Lib/X64/Release	2m 28s
CMake/AssertionsFuzz/Linux/Lib/X64/Release	1m 14s
CMake/AssertionsFuzz/MacOSX/Lib/X64/Release	2m 6s
	41m 0s

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