Use mardyn_exit to terminate program cleanly

Co-authored-by: FG-TUM <[email protected]>

src/MarDyn.cpp

@@ -138,7 +138,7 @@ int main(int argc, char** argv) {
 	MPI_Init_thread(&argc, &argv, thread_support_level_requested, &thread_support_level_provided);
 	if (thread_support_level_provided < thread_support_level_requested) {
 		std::cerr << "Error: MPI implementation does not support the requested thread support level." << std::endl;
-		std::exit(EXIT_FAILURE);
+		mardyn_exit(EXIT_FAILURE);
 	}
 #else
 	MPI_Init(&argc, &argv);