[patch] Remove gimple.h from header files.

[Andrew MacLeod]

There are currently only 2 .h files which include gimple.h, so removing 
this indirection is not too difficult.

Similar to the tree.h change Diego made, only .c files should include 
gimple.h.

Bootstraps on x86_64-unknown-linux-gnu, regression tests are running.  
Assuming no issues, OK?

Andrew
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