venus depends on libafsauthent

venus depends on libafsauthent

Add an explicit dependency on libafsauthent for src/venus, since it
is needed to build afsio.  This can cause parallel builds to fail.

Reviewed-on: http://gerrit.openafs.org/5171
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
(cherry picked from commit 784a410d0f1d6b5649c5b4943eb1b945ef7d70e8)

Change-Id: I8baf9008e4f59d916242e0a8ac9bda19522f0b0d
Reviewed-on: http://gerrit.openafs.org/8800
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>
Reviewed-by: Paul Smeddle <paul.smeddle@gmail.com>