man-pages: build bos getrestricted / setrestricted

build missing bos man pages on windows.

Change-Id: I37ccc402487bae04a7344a4276d246bd535bf1a6
Reviewed-on: http://gerrit.openafs.org/9944
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>