Avoid "warning: no newline at end of file" in importlib.h.

Python/freeze_importlib.py

@@ -25,6 +25,8 @@ def main(input_path, output_path):
     with open(output_path, 'w', encoding='utf-8') as output_file:
         output_file.write('\n'.join(lines))
         output_file.write('/* Mercurial binary marker: \x00 */')
+        # Avoid a compiler warning for lack of EOL
+        output_file.write('\n')
 
 
 if __name__ == '__main__':