There are a few major modes which are not based on prog-mode, that I
want to behave like prog-mode. Previously each did nearly all the same
setup that's done via the prog-mode hooks. Now instead let's actually
run runs the hooks for prog-mode.
The original code to fix the incompatibility didn't see to work anymore,
so refactored it a bit to so it goes about things a bit more carefully,
and that seemed to fix it.
