LibNIDS multithreading patch

libnids-1.20-mt.patch.gz - My patch against libnids-1.20 to start ip defragmentation and tcp stream assembly in a different thread. Compiling libNIDS in an environment where glib-2.0 is available enables libnids to use two different threads - one for receiving IP fragments from libpcap, and one, with lower priority, to process fragments, streams and to notify callbacks. Preferrably using nids_run() this behavior is invisible to the user.