Backport: Convert package.pl to Python.

[MisterCalvin]

The win32-1.9 builder completes the build but times out in the upload phase because it still runs package.pl, which hangs while downloading the now-retired GeoLite2 archive. I believe @dvander will need to update the builder on his side to execute package.py instead of package.pl (just like the win32-1.10 builder does)

Cherry-picked from 27f451a

[MisterCalvin]

I realized after opening this that linux-1.9 executes the same package.pl and finishes the upload stage without issue, so I'm not sure about this now

[psychonic]

I think your first assessment was probably correct. I can take a closer look at this later today or tomorrow.

For what it's worth, the buildbot scripts are public. (There's just no automation to automatically update them on the build master). This is the relevant piece, https://github.com/alliedmodders/build-configs/blob/master/masters/amxmodx/builders.py#L30-L38

[MisterCalvin]

Oh nice, thanks psy. Don't know how I missed that