Without this, the vcl's AboutDialog conflicts with the AboutDialog from
cui during linking of liblo-native-code.so.

Change-Id: Ie6e5ddd52bb7bdee1c7d53c37ea566d7ce6c9385
Reviewed-on: https://gerrit.libreoffice.org/73613
Tested-by: Jenkins
Reviewed-by: Jan Holesovsky <kendy@collabora.com>