Remove openmp from projects list that is actually built

Summary: Windows is loking for project files but openmp sould not be built. Analogous to python.

Test Plan: Covered by current tests

Reviewers: O1 MITK Core, kislinsk

Reviewed By: O1 MITK Core, kislinsk

Maniphest Tasks: T25420

Differential Revision: https://phabricator.mitk.org/D176