Local wheel built on Linux exhibits multiple library import errors when loading wrapper library

[michaeltryby]

Building owa-epanet wheel locally on Ubuntu 18 (WSL) with Python 3.7 in a Conda env.

The build and install proceed as normal. I get the following error when running pytest

(base) mtryby@DESKTOP-NLLFR13:~/OWA/epanet-python/owa-epanet$ python -m pytest
================================================= test session starts ==================================================
platform linux -- Python 3.7.6, pytest-6.0.2, py-1.9.0, pluggy-0.13.1
rootdir: /home/mtryby/OWA/epanet-python/owa-epanet
collected 0 items / 1 error

======================================================== ERRORS ========================================================
_______________________________________ ERROR collecting test/test_owa_epanet.py _______________________________________
ImportError while importing test module '/home/mtryby/OWA/epanet-python/owa-epanet/test/test_owa_epanet.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
../../../miniconda3/lib/python3.7/site-packages/epanet/toolkit.py:14: in swig_import_helper
    return importlib.import_module(mname)
../../../miniconda3/lib/python3.7/importlib/__init__.py:127: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
<frozen importlib._bootstrap>:1006: in _gcd_import
    ???
<frozen importlib._bootstrap>:983: in _find_and_load
    ???
<frozen importlib._bootstrap>:967: in _find_and_load_unlocked
    ???
<frozen importlib._bootstrap>:670: in _load_unlocked
    ???
<frozen importlib._bootstrap>:583: in module_from_spec
    ???
<frozen importlib._bootstrap_external>:1043: in create_module
    ???
<frozen importlib._bootstrap>:219: in _call_with_frames_removed
    ???
E   ImportError: libpython3.7m.so.1.0: cannot open shared object file: No such file or directory

During handling of the above exception, another exception occurred:
../../../miniconda3/lib/python3.7/importlib/__init__.py:127: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
test/test_owa_epanet.py:5: in <module>
    import epanet.toolkit as en
../../../miniconda3/lib/python3.7/site-packages/epanet/toolkit.py:17: in <module>
    _toolkit = swig_import_helper()
../../../miniconda3/lib/python3.7/site-packages/epanet/toolkit.py:16: in swig_import_helper
    return importlib.import_module('_toolkit')
../../../miniconda3/lib/python3.7/importlib/__init__.py:127: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
E   ModuleNotFoundError: No module named '_toolkit'
=============================================== short test summary info ================================================
ERROR test/test_owa_epanet.py
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Interrupted: 1 error during collection !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
=================================================== 1 error in 0.41s ===================================================

[samhatchett]

dupe of #82