m32r-protos.h: Remove the prototype for m32r_setup_incoming_varargs.

	* config/m32r/m32r-protos.h: Remove the prototype for
	m32r_setup_incoming_varargs.
	* config/m32r/m32r.c (TARGET_PROMOTE_PROTOTYPES): New.
	(TARGET_STRUCT_VALUE_RTX): Likewise.
	(TARGET_RETURN_IN_MEMORY): Likewise.
	(TARGET_SETUP_INCOMING_VARARGS): Likewise.
	(m32r_return_in_memory): New.
	(m32r_setup_incoming_varargs): Make it static.
	* config/m32r/m32r.h: Remove #undef of
	ASM_OUTPUT_EXTERNAL_LIBCALL.  Remove the commented-out
	definitions of PROMOTE_FUNCTION_ARGS and
	PROMOTE_FUNCTION_RETURN.
	(PROMOTE_PROTOTYPES): Remove.
	(RETURN_IN_MEMORY): Likewise.
	(STRUCT_VALUE): Likewise.

From-SVN: r76834