Kill strict_prototype. Backwards compatibility only for
	non NO_IMPLICIT_EXTERN_C systems.
	* cp-tree.h (flag_strict_prototype): Remove.
	(strict_prototype): Remove.
	(strict_prototypes_lang_c, strict_prototypes_lang_cplusplus): Remove.
	* decl.c (maybe_push_to_top_level): Adjust.
	(pop_from_top_level): Adjust.
	(decls_match): Only allow sloppy parm matching for ancient
	system headers.
	(init_decl_processing): Adjust.
	(grokdeclarator): Adjust.
	* decl2.c (flag_strict_prototype): Remove.
	(strict_prototype): Remove.
	(strict_prototypes_lang_c, strict_prototypes_lang_cplusplus): Remove.
	(lang_f_options): Remove "strict-prototype".
	(unsupported-options): Add "strict-prototype".
	* lex.c (do_identifier): Adjust.
	(do_scoped_id): Adjust.
	* parse.y (empty_parms): Adjust.
	* class.c (push_lang_context): Adjust.
	(pop_lang_context): Adjust.
	* typeck.c (comp_target_parms): Adjust.

From-SVN: r35254