[committed] Fix one -jN bug on powerpc-darwin

[Andrew Pinski]

Noticed why try to do a "make -j3 all" inside the GCC subdirectory.

Committed as obvious after a bootstrap/test.

Thanks,
Andrew Pinski

ChangeLog:

	* config/t-darwin (darwin-c.o): Depend on $(TREE_H) instead of tree.h.


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