* gcc.c (cpp_unique_options): Generate -MDX and -MMDX from -MD and
	-MMD.

c-family:
	* c.opt (MD, MMD): Change to MDX and MMDX.
	* c-opts.c (c_common_handle_option): Use OPT_MMD and OPT_MMDX.

fortran:
	* lang.opt (MD, MMD): Change to MDX and MMDX.
	* cpp.c (gfc_cpp_handle_option): Use OPT_MMD and OPT_MMDX.

From-SVN: r163209