mail/meli: minor changes

* Makefile: wrap at 72ch; point OPENSSL_DIR to SSLBASE.
* distinfo: move distfiles to DIST_SUBDIR as main tarball lacks name.
* carg-depends.mk fix unfetchable curl crate.

Important recent changes not included in changelog:

- Various changes improving navigation flexibitity and UI widgets.
- `ffba203` sidebar: added support for Home and End key navigation
- `f193bdf` meli/jobs_view: adde column headers and sorting. Sort with
  `sort <index> [asc/desc]` command or by pressing `1..5` keys.
  Press them again to toggle between asc and desc.
- `89c90f2` added NNTP support.

(vins)