Is there any reason threads shouldn't be enabled by default at compile
time? Having them available might give us cleaner solutions for bug 3810
(Delay due to stat()ing each recent entry in the main window and bug
5356 (Delay due to DNS when checking capture filter syntax).
The only caveat that I'm aware of is that you shouldn't use GDK (and
therefore most GTK+) routines on Windows:
http://developer.gnome.org/gdk/2.24/gdk-Threads.html
However, this shouldn't apply to stat() or pcap_compile_nopcap().
