Merge pull request #420 from onekk/master

New Packages: perl-Gtk2 perl binding for Gtk2
Thunar: make gvfs optional.
xfce4-panel: make this build again.
libxfce4util: move so symlinks to -devel pkg.
xfburn: update to 0.5.2.
libxfcegui4: removed; obsolete and no revdeps.
xfce4-mixer: make this build again.
xfce4-appfinder: make this build again.
xfce4-power-manager: make this build again.
xfce4-screenshooter: rebuild.
xfce4-sensors-plugin: make this build again.
xfce4-screenshooter: fix X11 linkage.
xfce4-session: make upower/udisks optional deps.
xfce4-settings: make this build again.
xfce4-terminal: make this build again.
xfconf: make this build again.
xfdesktop: make this build again.
xfwm4: make this build again.
thunar-volman: make this build again.
exo: make this build again.