This fix a build error since otherwise X libraries are required
Backport of 759cc275

Change-Id: Iba718969dca90563ba9e60aa16944e6de67c7141
Reviewed-on: https://gerrit.libreoffice.org/3786Reviewed-by: Andras Timar <atimar@suse.com>
Tested-by: Andras Timar <atimar@suse.com>