cd4dcac89a
As the xinstall(8) utility had to be patched up to work with the POSIXly correct basename()/dirname() prototypes, we make it pretty hard to build previous versions of FreeBSD on HEAD. xinstall(8) is part of the bootstrap tools. Add some logic to <libgen.h> to automatically detect bad calls to dirname() based on the type of the argument. If the argument is of type 'const char *', we simply fall back to calling into dirname@FBSD_1.0 directly. I'll also give basename() similar treatment when importing the thread-safe version of that function. Tested by: bdrewery, madpilot (thanks!)
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