build: Default to VULKANSC=ON #244

Job	Run time
check_vvl	1m 28s
linux (address sanitizer, debug, robinhood ON )	24m 7s
Ubuntu Backcompat	9m 11s
mingw	5m 20s
linux (address sanitizer, release, robinhood ON )	28m 30s
windows (amd64)	17m 3s
linux (thread sanitizer, debug, robinhood ON )	31m 13s
windows (amd64_x86)	16m 57s
linux (thread sanitizer, release, robinhood ON )	26m 32s
linux (address sanitizer, release, robinhood OFF )	28m 15s
	3h 8m 36s

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