Python binding contains build directory path
```
I am getting these warnings from the FreeBSD ports framework:
Error: 'lib/python3.7/site-packages/yoda1/__pycache__/__init__.cpython-37.pyc' is referring to /disk-samsung/freebsd-ports/science/yoda/work/stage
Error: 'lib/python3.7/site-packages/yoda/__pycache__/root.cpython-37.pyc' is referring to /disk-samsung/freebsd-ports/science/yoda/work/stage
Error: 'lib/python3.7/site-packages/yoda/__pycache__/search.cpython-37.pyc' is referring to /disk-samsung/freebsd-ports/science/yoda/work/stage
Error: 'lib/python3.7/site-packages/yoda/__pycache__/plotting.cpython-37.pyc' is referring to /disk-samsung/freebsd-ports/science/yoda/work/stage
Error: 'lib/python3.7/site-packages/yoda/__pycache__/__init__.cpython-37.pyc' is referring to /disk-samsung/freebsd-ports/science/yoda/work/stage
Error: 'lib/python3.7/site-packages/yoda/__pycache__/script_helpers.cpython-37.pyc' is referring to /disk-samsung/freebsd-ports/science/yoda/work/stage
Warning: 'lib/python3.7/site-packages/yoda/core.so' is not stripped consider trying INSTALL_TARGET=install-strip or using ${STRIP_CMD}
Warning: 'lib/python3.7/site-packages/yoda/util.so' is not stripped consider trying INSTALL_TARGET=install-strip or using ${STRIP_CMD}
which indicates that Yoda installs broken files because installed paths should never contain build directory path,
```
Version 1.9.0
issue