sed pluginexecdir in run-gabble.sh
sed pluginexecdir in run-gabble.sh

Commit 352d2da805561ec0164a6e800cd3c3e3bbc629f3 starting using
pluginexecdir instead of ${libdir}/telepathy/gabble-0. Unfortunately the
generation of run-gabble.sh wasn't adapated

Ziemin/telepathy-gabble,Ziemin/telepathy-gabble,Ziemin/telepathy-gabble,Ziemin/telepathy-gabble