[MacPorts] #67787: Detect other possible default -Werror compiler errors during configure

[MacPorts]

#67787: Detect other possible default -Werror compiler errors during configure
--------------------------+--------------------
 Reporter:  chrstphrchvz  |      Owner:  (none)
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  base          |    Version:  2.8.1
 Keywords:                |       Port:
--------------------------+--------------------
 In response to Apple Clang 12 treating implicit function declarations as
 errors rather than warnings, MacPorts now warns if a port may have
 configured incorrectly because of such errors.

 Newer LLVM Clang and possibly future GCC treat other warnings as errors by
 default; [https://wiki.gentoo.org/wiki/Modern_C_porting] currently lists
 `-Werror=int-conversion`, `-Werror=implicit-int`, and `-Werror
 =incompatible-function-pointer-types`. Can MacPorts’ warnings be extended
 to check for these other errors as well, and/or reorganized to accommodate
 future ones more easily?

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Ticket URL: <https://trac.macports.org/ticket/67787>
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