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.h

@@ -1,10 +1,13 @@
 #ifndef LINUXINTERFACES_H_
 #define LINUXINTERFACES_H_
 
-#include <arpa/inet.h>
-#include <dirent.h>
+#ifndef __APPLE__
 #include <linux/limits.h>
 #include <linux/wireless.h>
+#endif
+
+#include <arpa/inet.h>
+#include <dirent.h>
 #include <netinet/in.h>
 #include <string.h>
 #include <sys/ioctl.h>