* decl.c (match_string_p): New helper function to explicitly match
	a string of characters.
	(match_attr_spec): Remove no longer needed DECL_COLON from decl_types.
	Delete decls array and peek_char.  Rewrite decl attribute parser to
	avoid calling gfc_match_strings.
	* match.c (gfc_match_strings): Delete unused function.
	* match.h (gfc_match_strings): Delete prototype.

From-SVN: r128028