New comment by leahneukirchen on void-packages repository

https://github.com/void-linux/void-packages/pull/34030#issuecomment-1013222970

Comment:
I rebuilt my docker image and hit:

```
make --no-print-directory wheel-SAGE_VENV-no-deps
[wheel-0.37.0] Attempting to download package wheel-0.37.0.tar.gz from mirrors
[wheel-0.37.0] ERROR: downloading is disabled, add file to template instead
[wheel-0.37.0] Error: spkg file '/usr/lib/sage-9.5.rc1/upstream/wheel-0.37.0.tar.gz' not found.
[wheel-0.37.0] This shouldn't happen, it is a bug in the sage-spkg script.
make[4]: *** [Makefile:2723: wheel-SAGE_VENV-no-deps] Error 1
make[3]: *** [Makefile:2723: /usr/lib/sage-9.5.rc1/local/var/lib/sage/venv-python3.10/var/lib/sage/installed/wheel-0.37.0] Error 2
```