[libgfortran] Patch to handle statically linked libgfortran

[FX Coudert]

> How does the test in check_effective_target_static_libgfortran check for
> use of static libgfortran?  Shouldn't it pass -static or something?  If
> it's really doing it already by a means that is not apprarent, please
> add a comment.
> 
> That proc has a comment that was copied from another proc, please fix
> that.

Sorry for these stupid errors, I should really have read that one 
through one more time before posting. Attached is an updated version 
with both errors corrected. OK?

FX
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