[x11-misc/alacarte-xfce] update version and add keywords back.

With latest gnome-menus and alacarte, bugs seems to be vanished, so
add keywords back and update alacarte version to 3.6.1, drop older version.
[media-sound/qmmp] remove, Portage version compiles
[gnome-extra/evolution-rss] version bump to 0.3.92

compiles with Evolution 3.6.2
[x11-misc/virtualgl] provide a smarter vgl sleep loop, gdm 3.6 may take a life to load