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Certain version of MOAB will create a variable called BUILD_SHARED_LIBS that
will hide the cache version inside SMTK. This mean that if you are building
smtk shared and with a static moab, you will actually build smtk statically.

The fix is to remove the local version of the variable after importing
the moab config file.

Previously we only could find and link against a developer build of moab,
as in the installed version the cmake files are installed in a different
relative location.

Now we expect the MOAB target to have a include dir transitive property set.