[Patch, Fortran, committed] PR36518 - Enable -Werror for libgfortran and fix a warning

[Tobias Burnus]

When building "libgfortran", I got the error:
   warning: format '%d' expects type 'int', but argument 2 has type 
'index_type'
which I fixed by a cast.

In order to ensure this won't happen again, I now build libgfortran with 
"-Werror". I hope the latter will not break too many platforms - on my 
system (x86-64-gnu-linux) libgfortran builds without any error/warning, 
but I'm not positive that this also the case for other platforms. 
Hopefully, the fallout (if any) is easily fixable.

Committed as Rev. 136761.

Tobias
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