[PATCH] Cast to uintptr_t when calling ptrace32 on aix

[David Edelsohn]

Thanks for uncovering this and creating a patch. Any patch like this
should be regression tested.

I thought that these issues had been addressed in Joel's patches from
last August.

https://sourceware.org/ml/gdb-patches/2013-08/msg00657.html

Why do we need to go through this delicate dance in slightly different
ways in multiple files?

Thanks, David