Log Message:
mail/meli: package revision.

* Make support for dbus, gpgme, notmuch and sqlite3 optional (enabled by
  default).
* Add optional support for debug tracing and html rendering via w3m
  (disabled by default.
* Add dependency on curl (required by melib).
* Install official documentation, themes and sample files.
* Simplify DESCR. Move any additional information in a README.pkgsrc
  and integrate it with recent upstream additions.
* Simplify RUSTFLAGS handling, avoiding redundancy.
* Allow package to build on any 64-bit arch (supported by rust),
  but those inherently unsupported by the package.
* Bump revision.