Python 3.13: numpy failure while building

[tjsr]

Among other issues that can be silent throughout the compile process, this failure was spotted in the build logs.

        its source directory; please exit the numpy source tree, and relaunch
        your python interpreter from there.

To Reproduce
Steps to reproduce the behavior:

1. Modify build scripts to use Python 3.13 (patch to come).
2. Run .\compile.ps1 -all -everything

Expected behavior
A clean build succeeds, with no errors throughout the build process.

*Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: Windows 11

Additional context
This is a TODO item in prep of trying to migrate CrossMgr to be happy and working on Python 3.13.
There will no-doubt be other issues to resolve.

For now it is low-priority, but just something I thought worth attempting in the meantime.