scripts/rsync-generation/mksnapshot: also compress using lzip

lzip seems to reach a better compression ratio than xz, let's see if we
can use it

Signed-off-by: Fabian Groffen <[email protected]>

Author: grobian

scripts/rsync-generation/mksnapshot.sh

@@ -48,6 +48,7 @@ COMPRS=(
 	"gz:gzip -c -9"
 	"bz2:bzip2 -c -9"
 	"xz:xz -c -9"
+	"lz:lzip -c -9"
 	"zstd:zstd -k -f -9"
 )