cube: Support runtime selection of WSI platform #627

Job	Run time
codegen	21s
chromium	1m 34s
android (armeabi-v7a)	39s
linux (gcc, g++, Debug, ubuntu-20.04)	55s
android (arm64-v8a)	39s
mac	13m 23s
linux (gcc, g++, Debug, ubuntu-22.04)	59s
mingw	1m 33s
linux (gcc, g++, Release, ubuntu-20.04)	1m 14s
tools_codegen	42s
linux (gcc, g++, Release, ubuntu-22.04)	58s
windows (Win32, Debug, windows-latest)	2m 29s
linux (clang, clang++, Debug, ubuntu-20.04)	55s
windows (Win32, Release, windows-latest)	2m 32s
linux (clang, clang++, Release, ubuntu-22.04)	1m 31s
windows (x64, Debug, windows-latest)	2m 34s
windows (x64, Release, windows-latest)	1m 58s
	34m 56s

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