[gfortran, committed] Backport f2c calling conventions to 4.0

[Tobias Schlüter]

I've committed the patch for f2c calling conventions together with the
followup fix from <http://gcc.gnu.org/ml/fortran/2005-05/msg00116.html> to the
4.0 branch.  I had intended to wait for the approval of the patch from
<http://gcc.gnu.org/ml/fortran/2005-05/msg00117.html>, but since the first
4.0.1 prerelease is scheduled for Friday (*) I decided to commit this
important functionality even though it's not in its cleanest form this way.
The patch for the remaining cleanup has been waiting for review long enough
that I assume that noone considers it important.

Bubblestrapped and regtested on i686-pc-linux, diff attached.

- Tobi

(*) http://gcc.gnu.org/ml/gcc/2005-05/msg01466.html
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