bin: clear temporary files on termination signals
This is particularly important for src/tests/satmin.test, where ltl2tgba might be killed while writing a huge temporary file used for SAT-based minimization. Before this patch, the temporary files would remain in src/tests/satmin.dir/, easily overflowing the 100GB limit of the docker containers we use on the build farm. * src/bin/common_setup.cc: Catch termination signals for all tools, even those that do not yet clear temporary files. * configure.ac: Check for sigaction.