Intel: Drop deprecated -i_dynamic flag from Fortran (#14507)

The -i_dynamic flag is deprecated and not even listed in the manual for
Intel Composer XE 2013.

Reported-by: Izaak Beekman <zbeekman@gmail.com>
Merge topic 'intel-no-i_dynamic' into next

f61bcbc Intel: Drop deprecated -i_dynamic flag from Fortran (#14507)