Fix python bindings so PYTHONPATH isn't needed

[scpeters]

This installs the python bindings for gz-math7 and sdformat13 to lib/python3.10 instead of lib/python and explicitly depends on the [email protected] formula. This should allow our bindings to be used with home-brew's [email protected] without setting PYTHONPATH.

[scpeters]

build bottle

[scpeters]

build bottle

[scpeters]

brew audit failed:

osrf/simulation/gz-math7:
  * python modules have explicit framework links
    These python extension modules were linked directly to a Python
    framework binary. They should be linked with -undefined dynamic_lookup
    instead of -lpython or -framework Python.
      /usr/local/opt/gz-math7/lib/python3.10/site-packages/gz/math.cpython-310-darwin.so
      /usr/local/opt/gz-math7/lib/python3.10/site-packages/ignition/math.cpython-310-darwin.so

[scpeters]

trying again with patch from gazebosim/gz-math#497

build bottle

[scpeters]

build bottle

[azeey]

Works great!