cube: Make Volk requirement explicit #521

Job	Run time
mac	13m 42s
codegen	34s
chromium	3m 0s
android (armeabi-v7a)	39s
linux (gcc, g++, Debug, ubuntu-20.04, XCB)	51s
android (arm64-v8a)	37s
mingw	2m 0s
linux (gcc, g++, Debug, ubuntu-22.04, XCB)	49s
tools_codegen	42s
linux (gcc, g++, Release, ubuntu-20.04, XCB)	49s
linux (gcc, g++, Release, ubuntu-22.04, XCB)	2m 21s
linux (gcc, g++, Release, ubuntu-22.04, WAYLAND)	1m 3s
windows (Win32, Debug, windows-latest)	2m 12s
linux (clang, clang++, Debug, ubuntu-20.04, XLIB)	52s
windows (Win32, Release, windows-latest)	2m 23s
linux (clang, clang++, Release, ubuntu-22.04, DISPLAY)	54s
windows (x64, Debug, windows-latest)	1m 55s
windows (x64, Release, windows-latest)	1m 36s
	36m 59s

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