The APR fix just handles macOS w/ Xcode9 or clang 5.0.0.
-Werror can be set "externally" and whether or not we should
actually die is debatable. But considering that AC_CHECK_LIB
will never use function prototypes, the long term solution may be
to simply never use that.

I'm +0 on removing the check for APRs but we need to
document this behavior someplace since it can easily cause
unrepeatable builds.

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