* c-decl.c (pop_scope): Replace warnings with call to
	warn_for_unused_label.
	* c-common.h (warn_for_unused_label): Declare.
	* c-common.c (warn_for_unused_label): Define.
cp/
	* decl.c (pop_label): Replace warning with call to
	warn_for_unused_label.

From-SVN: r121310