cube: Make Volk requirement explicit #538

Job	Run time
chromium	2m 0s
linux (gcc, g++, Debug, ubuntu-20.04, XCB)	55s
codegen	21s
linux (gcc, g++, Debug, ubuntu-22.04, XCB)	55s
android (armeabi-v7a)	45s
linux (gcc, g++, Release, ubuntu-20.04, XCB)	47s
mac	13m 55s
android (arm64-v8a)	1m 23s
mingw	1m 48s
linux (gcc, g++, Release, ubuntu-22.04, XCB)	1m 2s
linux (gcc, g++, Release, ubuntu-22.04, WAYLAND)	51s
tools_codegen	36s
linux (clang, clang++, Debug, ubuntu-20.04, XLIB)	46s
windows (Win32, Debug, windows-latest)	2m 50s
linux (clang, clang++, Release, ubuntu-22.04, DISPLAY)	59s
windows (Win32, Release, windows-latest)	2m 48s
windows (x64, Debug, windows-latest)	1m 13s
windows (x64, Release, windows-latest)	2m 25s
	36m 19s

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