configury: don't conflate *_DATA and _DEPS.

* lib/zmacs/zmacs.mk (dist_zmacsdata_DATA): Remove
$(dist_smacscmds_DATA).
(doc/zmacs.1, ldoc_DEPS): Replace dist_zmacsdata_DATA with
zmacs_zmacs_DEPS.
* lib/zz/zz.mk: And again!

Signed-off-by: Gary V. Vaughan <gary@gnu.org>
travis: simplify custom travis build script.

* travis.yml.in: Merge improvements from slingshot, and simplify.
* .travis.yml: Regenerate.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>