Windows: Use %p for ptrs in redirector trace messages

Pointers were being logged with %08lX which results in partial
pointer values being logged on 64-bit systems.

Change-Id: Ic11e5b607b3df41f145536dfcb02dfa22537ee77
Reviewed-on: http://gerrit.openafs.org/8943
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>