Merge from gnulib, porting to Tru64.
* lib/lstat.c, lib/stat.c, m4/include_next.m4, m4/nocrash.m4: * m4/signal_h.m4, m4/time_h.m4, m4/unistd_h.m4: Merge from gnulib. This fixes a compilation error on Tru64 UNIX aka OSF/1 5.1 DTK cc. There is also some mingw stuff here that doesn't affect Emacs.
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