[gfortran] Change libgfortran license to GPL+exception

[Tobias Schlüter <tobias dot schlueter at physik dot uni-muenchen dot de>]

Following Mike Stump's advice, I prepared a patch which changes libgfortran to
GPL+exception. I've taken the wording from libgcc2.c and changed all files
which had a copyright header to use that license (the only ones which don't
are a few m4 scripts, and fmain.c, which probably is not copyrightable). I
also added 2004 to the copyright years, as I assumed that this change would be
copyrightable.

Previous licenses some files were plain GPL, a few said LGPL. Besides this, I
also fixed one glaring typo in the header of runtime/pause.c and added a
copyright line to runtime/select.c, after verifying which years had to be added.

Patch gzipped due to its size and its repetitive nature (>200kb, the gzipped
version is <8kb).

I verified that the library still builds, but I haven't regenerated the
generated files. Paul, could you please apply the patch and do this, if it
gets approved?

Thanks,
- Tobi

2004-09-01  Tobias Schlueter  <tobias.schlueter@physik.uni-muenchen.de>
	
	* all files: Change copyright header to GPL+exception, add 2004 to
	copyright years.
	* runtime/pause.c: In addition, fix typo.
	* runtime/select.c: In addition, add copyright line.

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