Set USE_PLUGIN_TELESCOPECONTROL depending on qt5serialport availability Fixes: - http://autobuild.buildroot.org/results/01452113e984de0ddf177a513d20287c96ebe0a3 Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>