Fix _msvccompiler.py

Author: jayvdb

pyoxidizer/src/cpython_lib_hacks/distutils/_msvccompiler.py

@@ -18,6 +18,7 @@
 import shutil
 import stat
 import subprocess
+import sys
 import winreg
 
 from distutils.errors import DistutilsExecError, DistutilsPlatformError, \