New review comment by ahesford on void-packages repository

https://github.com/void-linux/void-packages/pull/26298#discussion_r523202825

Comment:
I don't believe the `numpy` build option is functional. Looking at `CMakeLists.txt`, setting `-DENABLE_NUMPY=ON` is only functional with both `-DENABLE_PRIVATE_API=ON` and `-DENABLE_WRAP_PYTHON=ON`. In addition, this requires `swig`, `python3-numpy` and probably `python3-devel`. You will also probably have to set `NUMPY_INC` to make this work properly for cross builds.

If you don't want to sort out the details, I suggest you just drop the `numpy` build option because it isn't on by default anyway.