sysconfig.py uses the environment variable `_PYTHON_SYSCONFIGDATA_NAME`
to decide where to look for the sysconfig data file with info about the compile target.
We also need to separately insure that our sysconfig data file is on the path. We
don't want the rest of our target stdlib on the path, so I made an extra sysconfigdata
folder, copied the sysconfig data into it, and put it on the path.
Hood Chatham