dwarf2.h, [...]: Add multiple-include guard.

dwarf2.h, [...]: Add multiple-include guard.

	* dwarf2.h, unwind-dw2-fde.h, unwind-pe.h, unwind.h:
	Add multiple-include guard.
cp:
	* parser.c (cp_parser_save_member_function_body): Mark the
	definition static.
treelang:
	* parse.y (yyerror): Mark the definition static.

From-SVN: r75536