Compile DIAL client and server for macOS.

Changes:
* Added method to get mac and ip address for OSX. Current Linux method
of query via SIOCGIFCONF doesn't work. Added code to read via getifaddrs() API.
* Put non OSX specific code under #ifdef flags.
* Removed few linker libraries which are not required (lcares and lrt).
* Fixed many warnings.

Tested on: OSX 10.12

server/nf_callbacks.c

@@ -8,6 +8,7 @@
 #include <regex.h>
 #include "dial_server.h"
 #include "url_lib.h"
+#include "nf_callbacks.h"
 
 extern char *spAppNetflix;
 extern char spNetflix[];