[wip/py-qpoases] Update PLIST: replace PYTHON_SOABI by PYTHON_EXT_SUFFIX

py-qpoases/PLIST

 @comment Tue Jan 15 11:19:09 CET 2019
 ${PYTHON_SITELIB}/qpOASES_interface-0.0.0-py${PYTHON_VERSION}.egg-info
-${PYTHON_SITELIB}/qpoases${PYTHON_SOABI}.so
+${PYTHON_SITELIB}/qpoases${PYTHON_EXT_SUFFIX}