[Patch, Fortran] PR54687 - Fortran options cleanup (part 2)

[Tobias Burnus]

This patch is a follow up to 
https://gcc.gnu.org/ml/gcc-patches/2014-12/msg01068.html and converts 
more flags to the common diagnostic handing. I think the rest can only 
be converted by modifiying the *.opt syntax, but I might be wrong.

The patch is relative to the Fortran-part approved patch 
https://gcc.gnu.org/ml/gcc-patches/2014-12/msg01068.html - and fixes 
some minor issues I found there compared to the old version (e.g. 
missing ToLower in *opt or < vs. > for fmax-array-constructor).

Built and currently regtested on x86-64-gnu-linux.
OK for the trunk?

Tobias
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