libpcap-1.9.1
Rename the test program directory to testprogs.
Check for no-additional-compiler-flags in the subdirectories as well.
Add -Wformat-nonliteral and fix most warnings that come up
Fix a set of trivial unused warnings
Remove trailing spaces/tabs
Clean up descriptions.
Fix a few warnings that came up after turning on a dozen more warnings
Have separate flags for "optimizer debug" and "print DOT graph".