package/ucl: new package

package/ucl: new package

UCL implements a number of compression algorithms that achieve an
excellent compression ratio while allowing *very* fast decompression.
Decompression requires no additional memory.

This is needed for UPX, which is needed for syslinux 6.x.

Signed-off-by: Frank Hunleth <fhunleth@troodon-software.com>
[yann.morin.1998@free.fr: don't add a menuconfig entry, since it
 currently is for internal use only]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Tested-by: Romain Naour <romain.naour@openwide.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>