Windows: Add bWow64 param to RDR_InitReq

Windows: Add bWow64 param to RDR_InitReq

Instead of using the pattern

  RDR_InitReq(&req);
  if (bWow64)
     req.flags |= CM_REQ_WOW64;

add bWow64 as a parameter to RDR_InitReq().

Change-Id: I2c02683ab857c6743b46e83dc3f9defa660263d0
Reviewed-on: http://gerrit.openafs.org/8157
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>