Case-sensitive filesystem check is broken, missing a script

[osrf-migration]

Original report (archived issue) by Steve Peters (Bitbucket: Steven Peters, GitHub: scpeters).

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I was reading through other code, and I noticed that IgnConfigureProject.cmake tries to call a bash script called case_sensitive_filesystem, but that file is not in this repository. I'm guessing this code was copied from gazebo, which does have this file:

• https://bitbucket.org/osrf/gazebo/src/default/tools/case_sensitive_filesystem

This file would need to be added to ign-cmake, installed, and the find path updated.

It is not urgent though.