Lzip offers better compression ratios and archival features compared to more common `.gz` or `.xz` formats, and is being used by some software to package their distfiles, e.g. `archivers/zutils`, `astro/gnuastro`,`sysutils/ddrescue`, for which we either have to use bigger `.tar.gz` distfile, or set `EXTRACT_DEPENDS=lzip:archivers/lzip` and then manually extract the distfile.
Proposed patch adds `.tar.lz` suffix support to our framework, since BSD `tar(1)` natively supports it.