Put openmp in spot where its allowed

src/pystencils_autodiff/tensorflow_jit.py

@@ -176,7 +176,7 @@ def compile_file(file,
                           _output_flag]
 
     if openmp:
-        command_prefix.append(_output_flag)
+        command_prefix.insert(2, _output_flag)
     destination_file = f'{file}_{_hash(".".join(command_prefix).encode()).hexdigest()}{_object_file_extension}'
 
     if not exists(destination_file) or overwrite_destination_file: