Unicode collation ignores control characters and other specific
characters, see
http://www.unicode.org/charts/collation/chart_Ignored.html
and thus is not suitable to be used for Equal/NotEqual operators.

Change-Id: Ib84713e1da59d92e07bc974d93b6def8217bb067
(cherry picked from commit 1e5e7b93)
Reviewed-on: https://gerrit.libreoffice.org/17240Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Tested-by: Markus Mohrhard <markus.mohrhard@googlemail.com>