build: Default to VULKANSC=ON #245

Job	Run time
linux (address sanitizer, debug, robinhood ON )	24m 9s
Ubuntu Backcompat	9m 24s
linux (address sanitizer, release, robinhood ON )	29m 19s
check_vvl	1m 40s
linux (thread sanitizer, debug, robinhood ON )	31m 58s
linux (thread sanitizer, release, robinhood ON )	25m 32s
mingw	5m 35s
windows (amd64)	17m 40s
linux (address sanitizer, release, robinhood OFF )	28m 51s
windows (amd64_x86)	17m 38s
	3h 11m 46s

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