message: [OpenMP][Cmake] Allowed OpenMP testing detect test compiler with same generator
  Fix ninja build detect test compiler failed under windows.
  Patch by Peiyuan Song
diff: @@ -99,7 +99,7 @@ if (${OPENMP_STANDALONE_BUILD})
  # project is built which is too late for detecting the compiler...
  file(MAKE_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/DetectTestCompiler)
  execute_process(
  - COMMAND ${CMAKE_COMMAND} ${CMAKE_CURRENT_LIST_DIR}/DetectTestCompiler
  + COMMAND ${CMAKE_COMMAND} -G${CMAKE_GENERATOR} ${CMAKE_CURRENT_LIST_DIR}/DetectTestCompiler
  -DCMAKE_C_COMPILER=${OPENMP_TEST_C_COMPILER}
  -DCMAKE_CXX_COMPILER=${OPENMP_TEST_CXX_COMPILER}
  WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/DetectTestCompiler
  