Windows: cleanup preprocessor definition namespace

Windows: cleanup preprocessor definition namespace

Do not use reserved preprocessor symbol names.  Instead
use OPENAFS_<PATH>_<HEADER>_H formatted names where <PATH>
is the subdirectory path from src/ in which the header
file originates in the repository.

Reviewed-on: http://gerrit.openafs.org/3599
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Jeffrey Altman <jaltman@openafs.org>
(cherry picked from commit 8e9fff9ed8d773e4a22730d485c0617c456bb0e0)

Change-Id: Ic99253b74d3d88712b1959757d294b31ad590ba0
Reviewed-on: http://gerrit.openafs.org/3806
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>