Look up unknown base classes using SWIG_MangledTypeQueryModule().
Revert to using SWIG_TypeCheck() instead of SWIG_TypeCheckStruct()
as the latter doesn't seem to work for this case (at least for PHP
right now).
Add mod_runme.php as a regression test for this.
Adjust the PHP test harness not to set up reflection for the module
unless it's actually needed for a testcase. Currently the approach
to find the module name doesn't work for multi-module testcases.
See #2126
