4028 remove CLOSED_IS_PRESENT

*** 730,747 ****
          else
                  machdir=$INSTALL_FILES/kernel
          fi
  
          srctrees=$SRC
-         if [[ -d $SRC/../closed && "$CLOSED_IS_PRESENT" != no ]]; then
-                 srctrees="$srctrees $SRC/../closed"
-         else
                  if [ -z "$ON_CRYPTO_BINS" ]; then
                          echo "Warning: ON_CRYPTO_BINS not set; pre-signed" \
                              "crypto not provided."
                  fi
-         fi
          if [[ $WANT64 = "yes" ]] ; then
                  # kmdbmod for sparc and x86 are built and installed
                  # in different places
                  if [[ $(mach) = "i386" ]] ; then
                          kmdbpath=$SRC/cmd/mdb/$isadir/$b64srcdir/kmdb/kmdbmod
--- 730,743 ----