BUG: Suppress cmake 3.0 warning about using LOCATION property

The current implementation uses a convoluted way to perform a
generation of a configuration file at build time. It is currently
working despite this warning.

This code should be refactored to use generated expressions in the
build time configuration files.

Change-Id: I7ce3ca60cbc666520f9c1801d06db2a2f47c8cb9
Merge topic 'SIMPLEITK-552_CMake3SuppressLOCATIONWarning' into next

82a9986d BUG: Suppress cmake 3.0 warning about using LOCATION property