buildsys: disable buggy or unhelpful warnings #98

Job	Run time
call-build-freebsd / build-freebsd	3m 14s
call-build-macos / build-macos	2m 26s
call-build-fedora / build-fedora	1m 52s
call-build-alpine / build-alpine	2m 6s
call-build-solaris / build-solaris	5m 45s
call-build-ubuntu / build-ubuntu	3m 53s
	19m 16s

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