Fix of building on Mac OS.

mysys/my_gethwaddr.c

@@ -32,8 +32,7 @@ static my_bool memcpy_and_test(uchar *to, uchar *from, uint len)
   return res;
 }
 
-#ifdef __FreeBSD__
-
+#if defined(__APPLE__) || defined(__FreeBSD__)
 #include <net/ethernet.h>
 #include <sys/sysctl.h>
 #include <net/route.h>
@@ -63,7 +62,7 @@ my_bool my_gethwaddr(uchar *to)
     if (ifm->ifm_type == RTM_IFINFO)
     {
       sdl = (struct sockaddr_dl *)(ifm + 1);
-      addr= LLADDR(sdl);
+      addr= (uchar *)LLADDR(sdl);
       res= memcpy_and_test(to, addr, ETHER_ADDR_LEN);
     }
   }