vkernel64 - Cleanup, unbreak 32 bit
* Remove stdio cruft from init_main.c
* Change vpte_t from 64-bits to u_long, so it will be 32 bits
on 32 bit machines and 64 bits on 64 bit machines. 32 bit
machines can't handle the address space breakdown or issue
atomic ops on 64 bit quantities.
Adjust various defines in sys/vkernel.h to accomodate both
cases.
* Adjust atomic ops used by vm/vm_fault.c for virtual page
table access (int -> long).
* Adjust atomic ops and types used by the 32 bit
platform/vkernel code, primarily (int -> long) and
also some vm_offset_t's which are really vm_paddr_t's
or vpte_t's.
* Adjust src/test/vkernel/Makefile to run properly on
a 32 or 64 bit system.