[Bug fortran/109512] accepts implicit dummy procedure even with "implicit none (external)"

[kargl at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109512

--- Comment #3 from Steve Kargl <kargl at gcc dot gnu.org> ---
Created attachment 63197
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=63197&action=edit
Patch