bomi: use python2 for build
bomi: use python2 for build

For one, python is required on host for waf (to build mpv). However,
python3.8 does not work with this, so use python2 for now.

necrophcodr/void-packages,necrophcodr/void-packages,necrophcodr/void-packages,necrophcodr/void-packages,necrophcodr/void-packages