libgomp routines for mingw32

[François-Xavier Coudert]

Attached patch enables compilation of libgomp and use of -fopenmp in
the resulting compiler on i386-pc-mingw32 when pthreads-win32
(http://sourceware.org/pthreads-win32/) is present.

In libgomp, a new config/mingw32 directory is created to contain the
windows-specific time routines (which are not very elegant, but then,
is sufficient for most uses, and could be improved with better code
later).

In gcc/config/i386/mingw32.h, GOMP_SELF_SPECS is defined so that
-fopenmp doesn't imply -pthread.

Bootstrapped on i386-pc-mingw32, with both C and Fortran. Tested on
simple C and Fortran OpenMP codes, as well as a huge quantum chemistry
package.

OK for mainline?


Thanks,
FX


:ADDPATCH libgomp:
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