- Asynchronous DNS resolver support assumed by default
- HAVE_ASYNC_DNS, HAVE_NB_DNS, and USE_NB_DNS preprocessor definitions
removed
- In the process, I added FindBIND and CheckNameserCompat CMake modules
- Forgot to remove USE_SELECT_LOOP from BuildOptions.cmake
- ACTIVE_MAPPING removed from config.h.in, code cleanup still pending
- EXPIRE_DFA_STATES removed from config.h.in, code cleanup still pending