Fix compile on Alpine Linux when using fortified headers #745
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This commit removes obsolete compatibility code that was causing compilation errors on Alpine Linux when the fortify-headers package is installed. In short, the
readlink
,symlink
andrealpath
compatibility functions in src/lib/libast/comp don't work with Alpine Linux's fortified headers. None of these functions are necessary to compile on current operating systems (tested on Linux with glibc and musl, {Free,Net,Open,DragonFly}BSD, illumos, Haiku and Cygwin) so these can be safely deleted. Additionally, some spurious macro hackery relating topoll
,strlcpy
,strlcat
and networking functions used in libcmduname
has also been deleted. (The patch to univlib.h is taken from #743 (comment).)Fixes #743