David P. Sicilia 85b4d7c8d6 CMake: include(CTest) only when building tests. ...

This is needed in order to support usage of this library as a
subdirectory in a parent project.  In that situation, prior
to this change, the inclusion of CTest would unconditionally
enable BUILD_TESTING which would then bleed into other parts
of the project.

Also added some comments explaining how this logic works.

2018-12-01 20:37:06 -05:00

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