buildsys: disable buggy or unhelpful warnings #92

Job	Run time
call-build-alpine / build-alpine	2m 12s
call-build-macos / build-macos	1m 44s
call-build-fedora / build-fedora	1m 52s
call-build-freebsd / build-freebsd	3m 9s
call-build-ubuntu / build-ubuntu	3m 50s
call-build-solaris / build-solaris	5m 21s
	18m 8s

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