Show test.pythoninfo, helpful for debugging test failures

python3.spec

@@ -1049,6 +1049,9 @@ CheckPython() {
   # Note that we're running the tests using the version of the code in the
   # builddir, not in the buildroot.
 
+  # Show some info, helpful for debugging test failures
+  LD_LIBRARY_PATH=$ConfDir $ConfDir/python -m test.pythoninfo
+
   # Run the upstream test suite, setting "WITHIN_PYTHON_RPM_BUILD" so that the
   # our non-standard decorators take effect on the relevant tests:
   #   @unittest._skipInRpmBuild(reason)