_PyImport_Fini(): Closed small memory leak when an embedded app calls

Py_Initialize()/Py_Finalize() in a loop.  _PyImport_Filetab needed to
be deallocated.  Partial closure of SF #110681, Jitterbug PR#398.

Python/import.c

@@ -132,6 +132,8 @@ _PyImport_Fini(void)
 {
 	Py_XDECREF(extensions);
 	extensions = NULL;
+	PyMem_DEL(_PyImport_Filetab);
+	_PyImport_Filetab = NULL;
 }