[libgfortran, patch] Rename numeric STOP runtime functions

[FX]

When support for F2008 requirements on numeric STOP statements was implemented, the old _gfortran_stop_numeric() runtime function was made obsolete and a new _gfortran_stop_numeric_f08() function was created, which is the only one used in the front-end nowadays. The old _gfortran_stop_numeric() was kept in libgfortran for ABI compatibility.

Now that we are breaking the ABI, the attached patch removes the older _gfortran_stop_numeric() function, and renames the _gfortran_stop_numeric_f08() function into _gfortran_stop_numeric(). That way, it is in line with the names of all other PAUSE/STOP/ERROR STOP runtime functions.

Bootstrapped and regtested on x86_64-apple-darwin16.3.0.
OK to commit?

FX

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