[pkg-fgfs-crew] Bug#750939: Bug#750939: flightgear: Occasional deadlock when processing key input

[Rebecca N. Palmer]

A quick test with --aircraft=b1900d --airport=EDDR and cycling through 
the views didn't reproduce this, but given its intermittent nature that 
doesn't prove anything.

Please install the debug symbols (apt-get install 
libsimgearcore3.0.0-dbg libsimgearscene3.0.0-dbg) and re-run your trace 
with "thread apply all bt full".