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/LinuxInterfaces.c

@@ -77,3 +77,4 @@ NetInterface getDefaultNetworkInterfaces()
     }
     return defaultNet;
 }
+