Strict compilation flags don't affect the unit tests

[nathangibson14]

This is an easy fix, the tests' CMakeLists.txt just need to be updated to use the same variables as the top-level CMakeLists.txt.

[jlconlin]

Is this something that can be set at the top level and propagated down, or do they have to be re-set at every level?

[nathangibson14]

@jlconlin The current repository-level CMakeLists.txt file only allow the tests to be run if the repository is the top-level. I'll likely change that some day, but this was in line with the previous rendition.

Regarding the necessary update, every test's CMakeLists.txt file needs to be updated, not just a simple flag at the top-level. devtools will make doing this quite easy, fortunately.

[jlconlin]

@nathangibson14 What I meant was can the top-level flags be passed to the tests in that repository, not to the dependencies. Sorry for the confusion.