tec-ng: Update default package selection

Add RUM and dbus-watchdog and enable remote-control's back-light control
via sysfs. Also disable OpenBox since we already build XFCE4.

Change-Id: I067aeb160fc9aea82a73e0a958fe989e7a08b7c2
Signed-off-by: Soeren Grunewald <soeren.grunewald@avionic-design.de>
Reviewed-on: http://review.adnet.avionic-design.de/688
Reviewed-by: Dirk Leber <dirk.leber@avionic-design.de>
docs: Update ubuntu howto

Correct some typos and rework the toolchain part of the documentation,
so pbs-stage1 is the preferred way. Also add configure usage to validate
that the essential tools are installed.

Change-Id: I6ac386bbcb6169ae31b4b779006768a2ae03178b
Signed-off-by: Soeren Grunewald <soeren.grunewald@avionic-design.de>
Reviewed-on: http://review.adnet.avionic-design.de/693
Reviewed-by: Alban Bedel <alban.bedel@avionic-design.de>
desktop/icons/hicolor: Update cross-compile patch

Without this, the package build gets stuck in a recursion, where the package
is constantly calling autoconf and never finishes.

Change-Id: Ia611cf0e11eedec94048d45268e21d90dae93d19
Signed-off-by: Soeren Grunewald <soeren.grunewald@avionic-design.de>
Reviewed-on: http://review.adnet.avionic-design.de/689
Reviewed-by: Julian Scheel <julian.scheel@avionic-design.de>
desktop/xfce/session: Fix dependency issue with iceauth.

The package depends on iceauth, so add it to the list of dependencies. In
order to pass the configure step, we also need to specify the path to iceauth
manually, because the detection is not working properly.

Change-Id: I15b4818b367f270d6fd80f71be712c6153718114
Signed-off-by: Soeren Grunewald <soeren.grunewald@avionic-design.de>
Reviewed-on: http://review.adnet.avionic-design.de/694
Reviewed-by: Julian Scheel <julian.scheel@avionic-design.de>