Use gfortran bug 54070 number

The ifort bug INTEL_DPD200255963 is the same as:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64229

Which was determined to be a duplicate for:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54070

So we just use GNU_54070 from now on for gfortran and we reuse the
INTEL_DPD200255963 define for the actual code.