Build

Update gn flags on Windows #109

Job	Run time
build (windows-latest, Release, x64)	2m 25s
build (windows-latest, Release, x86)	2m 28s
build (windows-latest, Debug, x64)	2m 29s
build (windows-latest, Debug, x86)	2m 16s
build (macos-latest, Release, x64)	7m 25s
build (macos-latest, Release, arm64)	7m 5s
build (macos-latest, Debug, x64)	8m 20s
build (macos-latest, Debug, arm64)	9m 46s
build (ubuntu-20.04, Release, x64)	12m 47s
build (ubuntu-20.04, Release, x86)	12m 47s
build (ubuntu-20.04, Debug, x64)	14m 2s
build (ubuntu-20.04, Debug, x86)	13m 28s
	1h 35m 18s

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