math/py-pplpy: Fix packaging with Python 3.8+

PR:		253815
Approved by:	python (with hat)

math/py-pplpy/pkg-plist

@@ -2,18 +2,18 @@
 %%PYTHON_SITELIBDIR%%/ppl/__pycache__/__init__.cpython-%%PYTHON_SUFFIX%%.opt-1.pyc
 %%PYTHON_SITELIBDIR%%/ppl/__pycache__/__init__.cpython-%%PYTHON_SUFFIX%%.pyc
 %%PYTHON_SITELIBDIR%%/ppl/bit_arrays.pxd
-%%PYTHON_SITELIBDIR%%/ppl/bit_arrays.so
+%%PYTHON_SITELIBDIR%%/ppl/bit_arrays%%PYTHON_EXT_SUFFIX%%.so
 %%PYTHON_SITELIBDIR%%/ppl/congruence.pxd
-%%PYTHON_SITELIBDIR%%/ppl/congruence.so
+%%PYTHON_SITELIBDIR%%/ppl/congruence%%PYTHON_EXT_SUFFIX%%.so
 %%PYTHON_SITELIBDIR%%/ppl/constraint.pxd
-%%PYTHON_SITELIBDIR%%/ppl/constraint.so
+%%PYTHON_SITELIBDIR%%/ppl/constraint%%PYTHON_EXT_SUFFIX%%.so
 %%PYTHON_SITELIBDIR%%/ppl/generator.pxd
-%%PYTHON_SITELIBDIR%%/ppl/generator.so
+%%PYTHON_SITELIBDIR%%/ppl/generator%%PYTHON_EXT_SUFFIX%%.so
 %%PYTHON_SITELIBDIR%%/ppl/linear_algebra.pxd
-%%PYTHON_SITELIBDIR%%/ppl/linear_algebra.so
+%%PYTHON_SITELIBDIR%%/ppl/linear_algebra%%PYTHON_EXT_SUFFIX%%.so
 %%PYTHON_SITELIBDIR%%/ppl/mip_problem.pxd
-%%PYTHON_SITELIBDIR%%/ppl/mip_problem.so
+%%PYTHON_SITELIBDIR%%/ppl/mip_problem%%PYTHON_EXT_SUFFIX%%.so
 %%PYTHON_SITELIBDIR%%/ppl/polyhedron.pxd
-%%PYTHON_SITELIBDIR%%/ppl/polyhedron.so
+%%PYTHON_SITELIBDIR%%/ppl/polyhedron%%PYTHON_EXT_SUFFIX%%.so
 %%PYTHON_SITELIBDIR%%/ppl/ppl_decl.pxd
 %%PYTHON_SITELIBDIR%%/ppl/ppl_shim.hh