0.39: issue with detecting pyparsing python module

From meson output:

spice-common| See also: https://github.com/mesonbuild/meson/issues/9300
spice-common| Message: Checking for python module pyparsing

subprojects/spice-common/meson.build:137:8: ERROR: Problem encountered: Python module pyparsing not found

From meson-logs/meson-log.txt:

Running command: /usr/bin/python3 -m six
--- stdout ---

--- stderr ---


Message: Checking for python module pyparsing
Running command: /usr/bin/python3 -m pyparsing
--- stdout ---

--- stderr ---
/usr/bin/python3: No module named pyparsing.__main__; 'pyparsing' is a package and cannot be directly executed

[tkloczko@ss-desktop SPECS]$ pip show pyparsing
Name: pyparsing
Version: 3.0.7
Summary: Python parsing module
Home-page: https://github.com/pyparsing/pyparsing/
Author: Paul McGuire
Author-email: ptmcg.gm+pyparsing@gmail.com
License: MIT License
Location: /usr/lib/python3.8/site-packages
Requires:
Required-by: matplotlib, packaging