[Patch,Fortran] F2008: Add RADIX= support to SELECTED_REAL_KIND

[Tobias Burnus]

To clean up my dirty tree ...
The attached patch implements RADIX=... support for SELECTED_REAL_KIND;
as gfortran only supports radix==2, the patch is effectively a
parse-only patch.

As the patch changes the ABI, I have duplicated the
_gfortran_selected_real_kind by creating a new
_gfortran_selected_real_kind2008 procedure. For systems supporting
symbol versioning, one could have kept the name in the front end.

Build and regtested on x86-64-linux.
OK for the trunk?

Tobias
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