rx: Remove multi_End_Ignore

rx: Remove multi_End_Ignore

Since commit "rx: Remove delays in multi_End_Ignore", multi_End_Ignore
and multi_Finalize_Ignore are unused in the tree, and should not be
used by callers. Remove the dead functions.

This commit bumps LT_current in libafsrpc to 3, because we are
removing the exported symbol multi_Finalize_Ignore.

Change-Id: I4d298f5118a69cfd04de44c3f268691a87a6d9a7
Reviewed-on: https://gerrit.openafs.org/14425
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
Tested-by: BuildBot <buildbot@rampaginggeek.com>