Merge branch 'kill-tests' of https://github.com/rudimeier/util-linux
column: inform user when multibyte conversion error occurs

The column(1) read input until conversion error, and used incomplete
input when outputing, that made at least me to wonder where the rest
disappeared without explanation.  IMHO it is better to fail immediately
rather than do only half of the task.

Signed-off-by: Sami Kerola <kerolasa@iki.fi>