Pacify clang without munging C source
* configure.ac (WARN_CFLAGS): With Clang, use -Wno-tautological-compare regardless of --enable-gcc-warnings. (WERROR_CFLAGS): Simplify assignments, and guarantee it’s always set. * lib/strftime.c: Copy from gnulib, reverting Clang-specific change which I hope is no longer needed. * src/emacs.c (main): Revert rlim_t change, as rlim_t is signed on some older non-POSIX hosts.
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