Link libafsauthent with -lresolv if required

Link libafsauthent with -lresolv if required

libafsauthent includes auth/cellconfig.c, which uses res_search, so it
requires -lresolv even if it isn't needed for gethostbyname.  Add
LIB_AFSDB to the link line for libafsauthent.

Change-Id: I4dafdf83db9a00e4e30bff7c59357c13bf7af961
Reviewed-on: http://gerrit.openafs.org/2402
Tested-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Jason Edgecombe <jason@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit 57d727da233252477c16a34cf628f6764534b8bc)