Windows: Kill AFS_LARGEFILES preprocessor symbol

Windows: Kill AFS_LARGEFILES preprocessor symbol

All builds define AFS_LARGEFILES so kill the symbol and
discard the !AFS_LARGEFILES source code.

Reviewed-on: http://gerrit.openafs.org/2910
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Jeffrey Altman <jaltman@openafs.org>
(cherry picked from commit d73bd5778a22f574a6f065a18f18d4379e9ffb4a)
Change-Id: I34e4a08472573f8ad103df6c556e90838b68117b
Reviewed-on: http://gerrit.openafs.org/3048
Tested-by: Derrick Brashear <shadow@dementia.org>
Reviewed-by: Derrick Brashear <shadow@dementia.org>