maint: set LUA_PATH correctly for make rockspecs in Travis CI.
maint: set LUA_PATH correctly for make rockspecs in Travis CI.

* .travis.yml (script): Use eval rather than env to push LUA_PATH
into the environment before running make rockspecs.

Signed-off-by: Gary V. Vaughan <f9023000f29773649f3850298becb9544b5fd6a9@gnu.org>

GUI/lyaml,GUI/lyaml