[Build, libgfortran, Patch] Make libgfortran's configure more cross-compile friendly

[Tobias Burnus]

Hi all,

at the GSoC Mentor summit, I had a chat with Joel, who asked me whether 
he should try to crosscompile also Fortran. Well, at the end I created 
the attached patch (based on what one had to do for libquadmath) and he 
successfully build fortran to target RTEMS for i386, sparc64, powerpc, 
mips, and m68k.

Additionally, I have bootstrapped it on x86-64-linux.
OK for the trunk?

Tobias
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