* doc/invoke.texi: Document -Wdelete-non-virtual-dtor.

c-family:
	* c.opt: Add -Wdelete-non-virtual-dtor.
	* c-opts.c (c_common_handle_option): Include it in -Wall.

cp:
	* init.c (build_delete): Warn when deleting type with non-virtual
	destructor.

testsuite:
	* testsuite/g++.dg/warn/delete-non-virtual-dtor.C: New.

From-SVN: r174643