Use Pointer instead of UnManagedStruct for void ** opaque out pointer in SQLite

[Kevin Tew]

I think use of "V" in your signature will allow you to do away with your 
C code

grep for nci_vVi in
t/pmc/nci.t
and
src/nci_test.c
for an example.

Note that it used Pointer not UnmanagedStruct

Kevin