message: Removing unnecessary -x c++ flag
diff: function(add_thrust_test TEST)
  set(TEST_SOURCE "${TEST}.cu")
  set(TEST_TARGET "test_thrust_${TEST}")
  - set_source_files_properties(${TEST_SOURCE} PROPERTIES LANGUAGE CXX COMPILE_FLAGS "-x c++")
  add_executable(${TEST_TARGET} ${TEST_SOURCE} testframework.cpp)
  target_include_directories(${TEST_TARGET} SYSTEM BEFORE
  PUBLIC
  