pidl/python: Provide static inline helper function ndr_PyLong_FromUnsignedLongLong

pidl/python: Provide static inline helper function ndr_PyLong_FromUnsignedLongLong

This should isolate any coverity warnings on 64-bit platforms
(where LONG_MAX is larger than any possible 32 bit value) to
a single spot, or possibly eliminate it.

This is needed for the unsigned 64 bit case, and on 32 bit
systems, as PyInt_FromLong is limited to a signed "long" int.

The compiler should be able to eliminate many of these calls
with the embedded type knowlege.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=11429

Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>