message: revert unit test changes and see if windows build works
diff: // terms of the GNU Lesser General Public License (as published by the Free
  // Software Foundation) version 2.1 dated February 1999.
  -#define CATCH_CONFIG_RUNNER
  -#include "catch.hpp"
  -#include "mfem.hpp"
  +// #define CATCH_CONFIG_RUNNER
  +// #include "catch.hpp"
  +// #include "mfem.hpp"
  +
  +// int main(int argc, char *argv[])
  +// {
  +// #ifdef MFEM_USE_MPI
  +// mfem::MPI_Session mpi;
  +// #endif
  -int main(int argc, char *argv[])
  -{
  -#ifdef MFEM_USE_MPI
  - mfem::MPI_Session mpi;
  -#endif
  +// // There must be exactly one instance
  +// int result = Catch::Session().run(argc, argv);
  +// return result;
  +// }
  - // There must be exactly one instance
  - int result = Catch::Session().run(argc, argv);
  - return result;
  -}
  +#define CATCH_CONFIG_MAIN
  +#include "catch.hpp"
  \ No newline at end of file
  