[patch] Fix many Makefile dependencies, round 2

[Steven Bosscher]

Hello,

Here is the next round of fixes.  I think I need one or two more
iterations before everything is fixed, but this already improves
things a bit again.

While working on this, I noticed that cfglayout.h was being included
by many files, for symbols that are not specific to cfglayout. I'll
fix that in another patch later this week.

For this one: Bootstrapped on powerpc64-unknown-linux-gnu. OK for trunk?

Ciao!
Steven
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