Update app-text/mupdf 1.2

I seem to have somehow screwed up importing mupdf-1.2 from upstream,
it should be fixed now.
Import gnome-extra/nm-applet 0.9.6.4-r1 from portage

This is now ~amd64 in Gentoo, so I'm updating to it.
Fix gnome-extra/nm-applet 0.9.6.4-r1 for gtk2

This allows me to use the gtk2 engine instead of the gtk3 engine so I
can avoid the unnecessary dependency on my XFCE4 desktop.
Additionally, this improves the integration with XFCE4 as I don't have
two different visual styles.
Update sys-devel/pconfigure to 0.3.0