build: use more gnulib modules for simpler code
* .gnulib: Update to latest, for sigpipe and sigaction modules. * bootstrap.conf (gnulib_modules): Add siaction, sigpipe, strerror_r. * tools/virsh.c (vshSetupSignals) [!SIGPIPE]: Delete, now that gnulib guarantees it. (SA_SIGINFO): Define for mingw fallback. * src/util/virterror.c (virStrerror): Simplify, now that gnulib guarantees the POSIX interface. * configure.ac (AC_CHECK_FUNCS_ONCE): Drop redundant check. (AM_PROG_CC_STDC): Move earlier, to keep autoconf happy.
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.gnulib @ 45d39ca1
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