Py_Main(): When compiled by Insure (i.e. __INSURE__ is defined), call

Py_Main(): When compiled by Insure (i.e. __INSURE__ is defined), call
the internal API function to release the interned strings as the very
last thing before returning status.  This aids in memory use debugging
because it eliminates a huge source of noise from the reports.  This
is never called during normal (non-debugging) use because releasing
the interned strings slows Python's shutdown and isn't necessary
anyway because the system will always reclaim the memory.