mysql-workbench: add workaround for gnome-keyring
virtualbox-extension-pack: update to version 4.3.20
claws-mail-git: update to version 3.11.1.r29.ga10cf75
libpng15: update to version 1.5.20
lib32-libpng15: update to version 1.5.20
opera-developer: update to version 27.0.1689.2