Tests: Activate InstallRequiredSystemLibraries OpenMP libs

The SimpleInstall test performs a smoke test of this module.
Activate the OpenMP code paths.

Tests/SimpleInstall/CMakeLists.txt

@@ -365,6 +365,7 @@ set(CPACK_PACKAGE_EXECUTABLES "SimpleInstall" "Simple Install")
 set(CMAKE_INSTALL_MFC_LIBRARIES 1)
 set(CMAKE_INSTALL_DEBUG_LIBRARIES 1)
 set(CMAKE_INSTALL_UCRT_LIBRARIES 1)
+set(CMAKE_INSTALL_OPENMP_LIBRARIES 1)
 include(InstallRequiredSystemLibraries)
 
 if(CTEST_TEST_CPACK)