[PATCH] Work around shortest-stem feature in make 3.82+

[Roland McGrath]

> make 3.82+ no longer selects pattern rules by order, but by shortest
> stem, so we need to add more rules to make sure we still get the right
> matches.

Sweet mother of god, what is that guy thinking?  I shudder to think at all
the subtle breakage introduced to makefile magic that has worked the same
for 20 years now.  He's kind of making me regret choosing him as maintainer.
Even I have a hard time figuring out what exactly this dismal change could
mean for complex uses of pattern rules like we have.