build: Default to VULKANSC=ON #239

Job	Run time
check_vvl	1m 22s
Ubuntu Backcompat	10m 16s
linux (address sanitizer, debug, robinhood ON )	34m 39s
linux (address sanitizer, release, robinhood ON )	15m 12s
linux (thread sanitizer, debug, robinhood ON )	40m 55s
linux (thread sanitizer, release, robinhood ON )	23m 30s
mingw	3m 43s
windows (amd64)	15m 16s
linux (address sanitizer, release, robinhood OFF )	15m 30s
windows (amd64_x86)	13m 10s
	2h 53m 33s

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