decl.c (warn_extern_redeclared_static): Use the location of newdecl in diagnostics, not input_location.

	* decl.c (warn_extern_redeclared_static): Use the location of
	newdecl in diagnostics, not input_location.
	(validate_constexpr_redeclaration): Likewise.
	(check_redeclaration_no_default_args): Likewise.
	(duplicate_decls): Likewise.
	(check_redeclaration_exception_specification): Likewise.
	Change second diagnostic to inform.

From-SVN: r223777