Remove directory name hack for xorriso, not needed for newer version

tools/boot/squeeze/boot-x86

@@ -44,20 +44,17 @@ NN=`echo $N | sed -e 's/_NONUS//'`
 # Exit if this is not a boot disk
 if [ $NN != 1 ] ; then exit 0; fi
 
+INSTALLDIR_i386="install.386"
+INSTALLDIR_amd64="install.amd"
+
 case "$MKISOFS" in
     *xorriso*)
         add_mkisofs_opt $CDDIR/../$N.mkisofs_opts "-isohybrid-mbr syslinux/usr/lib/syslinux/isohdpfx.bin"
         add_mkisofs_opt $CDDIR/../$N.mkisofs_opts "-partition_offset 16"
-        INSTALLDIR_i386="install_386"
-        INSTALLDIR_amd64="install_amd"
 # uncoment to add a small FAT partition on the media
 #        /sbin/mkfs.msdos -n Bla -C test.fat 8192
 #      add_mkisofs_opt $CDDIR/../$N.mkisofs_opts "-append_partition 2 0x01 test.fat"
        ;;
-    *)
-        INSTALLDIR_i386="install.386"
-        INSTALLDIR_amd64="install.amd"
-        ;;
 esac
 
 if [ "$ARCH" = i386 ]; then