Fix bug where stp target was not exported in the ``STPTargets.cmake`` in the root of the build tree.
Fix bug where stp target was not exported in the ``STPTargets.cmake``
in the root of the build tree.

kyledewey/stp,kyledewey/stp,kyledewey/stp,kyledewey/stp,kyledewey/stp,kyledewey/stp