liblas: add test

Add a simple (bad) test for liblas. Per
https://github.com/Homebrew/homebrew/wiki/Formula-Cookbook#add-a-test-to-the-formula,
a `foo --version` style test is inferior to a functional test, but since
finding or grabbing or creating a lasfile is non-trivial, it is arguable
that a `--version` test is ok here (or at least better than no test).

Users can install `--with-test` to run liblas's internal tests after
building for a more complete test of the suite.

Closes #29389.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
liblas: add optional laszip dep

Add optional laszip dependency. Laszip (http://www.laszip.org) is a
lossless compression format for las files.

Closes #29390.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>