Fix coretypes.h-related dependencies

Fix coretypes.h-related dependencies

The bug fix here is to build/min-insn-modes.o, the rest are related
clean-ups.

2017-07-08  Richard Sandiford  <richard.sandiford@linaro.org>

gcc/
	* Makefile.in (HOOKS_H, RTL_BASE_H, FUNCTION_H, EXPR_H, REGS_H)
	(REAL_H): Remove $(MACHMODE_H).
	(FIXED_VALUE_H, TREE_CORE_H, CFGLOOP_H): Remove $(MACHMODE_H) and
	double-int.h.
	(CORETYPES_H): Add signop.h, wide-int.h, wide-int-print.h,
	$(MACHMODE_H) and double-int.h.
	(build/min-insn-modes.o): Depend on $(CORETYPES_H) rather than
	$(MACHMODE_H).
	(gengtype-state.o, gengtype.o, build/gengtype.o): Don't depend on
	double-int.h.

From-SVN: r250075