Windows: add cm_req_t to RDR_ioctl_t

Windows: add cm_req_t to RDR_ioctl_t

The cm_req_t structure flags store information related to
the source of the request and whether the process is WOW64 or not.
This information is required for proper pioctl processing.  Add
a cm_req_t structure to the RDR_ioctl_t structure and initialize
it in RDR_SetupIoctl() which is called from RDR_PioctlOpen().

Change-Id: I351101f036f63bbb1f0d7b19e9b092b18a3e070e
Reviewed-on: http://gerrit.openafs.org/8158
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Tested-by: Jeffrey Altman <jaltman@your-file-system.com>