settings: Make warnings on by default #10860

Job	Run time
code-format	27s
check_vvl	1m 10s
linux (address sanitizer, release, robinhood ON )	28m 16s
android (arm64-v8a, ON, c++_shared)	9m 26s
chromium (target_os="linux" target_cpu="x64")	8m 47s
chromium (target_os="android" target_cpu="arm64")	11m 27s
linux (address sanitizer, release, robinhood OFF )	30m 27s
androidOnLinux	8m 29s
android (armeabi-v7a, OFF, c++_static)	5m 43s
Ubuntu Backcompat	2m 27s
linux (thread sanitizer, release, robinhood ON )	10m 45s
linux (Build Only, debug, robinhood ON )	12m 41s
mingw	9m 40s
windows (amd64)	11m 17s
windows (amd64_x86)	10m 48s
iOS	5m 54s
androidUpload	4m 22s
windowsUpload	15m 22s
linux Upload	8m 38s
	3h 16m 6s

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