Try to fix some of the failing tests on Win64. PY_SSIZE_T_MAX (8 bytes)

Try to fix some of the failing tests on Win64.  PY_SSIZE_T_MAX (8 bytes)
is larger than what can fit into a long (4 bytes).  Hopefully this will
fix more problems than it creates.  There are many, many compile warnings
on Win64.  Each of these should be investigated to determine if they
are real problems or not.  Many of these presumably affect the trunk too.