rc_subr and ports

["Peter Avalos" <pavalos@xxxxxxxxxxxx>]

Since we already have rc_subr, there's no need for ports to make a
dependency on sysutils/rc_subr (especially since it doesn't work).

This should be included in share/mk/bsd.port.mk and share/mk/bsd.dfport.mk:

. if defined(USE_RC_SUBR)
. undef USE_RC_SUBR
RC_SUBR=	/etc/rc.subr
. endif


--Pete