[patch] Never include coretypes.h in another header file

[Steven Bosscher]

Hello,

As suggested by Joseph. Subject says all. This turned out to be easier
than I expected: Almost all Makefile rules already include
coretypes.h, I only had to adjust something for realmpfr.o.

Bootstrapped on x86_64-unknown-linux-gnu. OK for trunk?

Ciao!
Steven
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