Avoid AFS_version conflicts in uafs

libuafs links in both afsd.o and AFS_component_version_number.o;
afsd.c #includes AFS_component_Version_number.c, which causes
symbol conflicts when linking shared.

Don't include the version file when compiling for UKERNEL, to
avoid the conflict.

Change-Id: I9474faf10e029d0022b12431aad51e27412b19fc
Reviewed-on: http://gerrit.openafs.org/11544
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: D Brashear <shadow@your-file-system.com>