Delete the frozen python dir

I verified that all the files remaining in it are loaded via the python
resource system and so are not needed.

bypy/linux/__main__.py

@@ -143,6 +143,7 @@ def copy_python(env):
         iv['sanitize_source_folder'](os.path.join(env.py_dir, x))
     py_compile(env.py_dir)
     freeze_python(env.py_dir, pdir, env.obj_dir, ext_map, develop_mode_env_var='KITTY_DEVELOP_FROM', remove_pyc_files=True)
+    shutil.rmtree(env.py_dir)
 
 
 def build_launcher(env):