Build failure on PowerPC in pf

[Justin Hibbits]

Building on PowerPC I see the following failure:

cc1: warnings being treated as errors

/home/chmeee/freebsd/head/sys/modules/pf/../../netpfil/pf/pf_ioctl.c:
In function 'pfioctl':
/home/chmeee/freebsd/head/sys/modules/pf/../../netpfil/pf/pf_ioctl.c:1357:warning:
cast to pointer from integer of different size [-Wint-to-pointer-cast]
/home/chmeee/freebsd/head/sys/modules/pf/../../netpfil/pf/pf_ioctl.c:1359:warning:
cast to pointer from integer of different size [-Wint-to-pointer-cast]
/home/chmeee/freebsd/head/sys/modules/pf/../../netpfil/pf/pf_ioctl.c:1361:warning:
cast to pointer from integer of different size [-Wint-to-pointer-cast]

struct pf_rule has counter_u64_t entries, which are actually pointers
to uint64_t's.  These pointers get assigned from the result of
counter_u64_fetch(), which returns a uint64_t.  Looks to me like
there's a bug in here, but I have no idea what to do to fix it.  And
I'm surprised this hasn't been reported against other 32-bit
architectures.

- Justin