void pointer conversion support, from Niall Douglas, then heavily

edited by DWA.  Merged from python-voidptr


[SVN r32857]

libs/python

@@ -1 +1 @@
-Subproject commit 2d117bc4ad6f81d664cc837eca13818ddce5ccf3
+Subproject commit 22e82ae30fcba2d29245806a9e05f7ada476feeb