OpenMP bug with gfortran when compile under Windows platform

[François-Xavier Coudert]

> you just port libgomp to mingw32 + pthreads-win32
> and assuming pthreads-win32 is sufficiently rich and not too buggy, it will
> just work.

With the attached patch, I can compile libgomp with

../gcc/configure --prefix=/mingw --disable-nls --with-ld=/mingw/bin/ld
--with-as=/mingw/bin/as --disable-werror --enable-bootstrap
--enable-threads=posix --with-win32-nlsapi=unicode
--host=i386-pc-mingw32 --enable-languages=c,fortran --enable-libgomp

and the resulting compiler and generated executables seem to work (I
tried a few C and Fortran toy codes). The main changes are to
libgomp/config/posix/time.c, which used functions not available on
mingw32. Would they be acceptable in this form (protected with #ifdef
_WIN32)? If so, I'll do some more testing, and officially submit the
patch.

FX
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