lzip is pretty niche: people are typically either sticking with that they know
(gzip, bzip) or using xz. Data point: only one recipe in oe-core is shipped as
a .lz file.
(From OE-Core rev: 80b0ac3bdbaee50d0023b7c869dd204485903dfe)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>