[patch] Fix many Makefile dependencies, round 3

[Steven Bosscher]

Hello,

A smaller patch this time, but bigger impact: GIMPLE_H does not have
to depend on TARGET_H. Only a few files need TARGET_H as well as
GIMPLE_H, and most of them already included TARGET_H anyway. The ones
that don't, are fixed with this patch.

Bootstrapped&tested on powerpc64-unknown-linux-gnu, and verified that
my contrib/check_makefile_deps.sh output has no new missing
dependencies (and far fewer unneeded deps). OK?

Ciao!
Steven
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