Build with PyPy3

Other “python_targets” USE_EXPAND flag values

Use Flag Description
python_targets_pypy3 Build with PyPy3
python_targets_python3_11 Build with Python 3.11
python_targets_python3_10 Build with Python 3.10
python_targets_python3_12 Build with Python 3.12

All packages providing a “python_targets_pypy3” USE flag (570)