CI: Fail compilation on implicit function declaration warnings #4963
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Should help avoid issues such as #3835 (comment).
Helped find an issue from #4700 linking with LCMS<2.7.
Another one almost snuck in in #4955 (fixed in 39ae5d6).
Changes proposed in this pull request:
-Werror=implicit-function-declaration
compiler flag.Failed build example: https://github.com/nulano/Pillow/runs/1239867650?check_suite_focus=true#step:5:40