C: convert return type of lookup_name_fuzzy from tree to const char *

C: convert return type of lookup_name_fuzzy from tree to const char *

gcc/c-family/ChangeLog:
	* c-common.h (lookup_name_fuzzy): Convert return type from tree to
	const char *.

gcc/c/ChangeLog:
	* c-decl.c (implicit_decl_warning): Update for conversion of
	return type of lookup_name_fuzzy to const char *.
	(undeclared_variable): Likewise.
	(lookup_name_fuzzy): Convert return type from tree to
	const char *.
	* c-parser.c (c_parser_declaration_or_fndef): Update for
	conversion of return type of lookup_name_fuzzy to const char *.
	(c_parser_parameter_declaration): Likewise.

gcc/ChangeLog:
	* gcc-rich-location.c
	(gcc_rich_location::add_fixit_misspelled_id): New overload, taking
	a const char *.
	* gcc-rich-location.h
	(gcc_rich_location::add_fixit_misspelled_id): Likewise.

From-SVN: r238517