gedit: unbreak build by adding pythonnative to inherit

error message was:
ERROR: This autoconf log indicates errors, it looked at host include and/or library paths while determining system capabilities.
Rerun configure task after fixing this. The path was '/home/andreas/tmp/oe-core-eglibc/work/armv7a-vfp-neon-angstrom-linux-gnueabi/gedit-2.30.4-r0/gedit-2.30.4'
ERROR: Function failed: do_qa_configure

Signed-off-by: Andreas Müller <schnitzeltony@googlemail.com>
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>