[4.6,patch,libgfortran/io] Fix build issue with _commit [PR5016]

[Tobias Burnus]

I intent to commit this patch - created mostly by Janne - soon to 
gcc-4_6-branch; it should solve a build issue.

The patch was build and regtested on x86-64-linux and build and tested 
on MinGW and Cygwin by Kai.

It is a follow up to http://gcc.gnu.org/ml/fortran/2011-10/msg00132.html 
/ http://gcc.gnu.org/ml/gcc-cvs/2011-10/msg00734.html

Please speak up immediately, if you have objects against the committal. 
(Another option would be to revert previous patch, which solved a severe 
performance regression on Windows - thus that patch plus this patch is 
better.)

Sorry for disrupting the 4.6.2 process a bit.

Tobias
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