Include <sys/socket.h>, too.

The Single UNIX Spec says AF_INET and AF_INET6 are defined by
<sys/socket.h>, which means you *should* include it if you want those
defines, and it doesn't look as if DragonFly BSD's <netinet/in.h>
includes it.

Do the includes in the order in whcih dumpcap does them.

Change-Id: I2ee611fc08a5487d5b8ed48396aa2a49447c881a
Reviewed-on: https://code.wireshark.org/review/15542
Reviewed-by: Guy Harris <guy@alum.mit.edu>

wsutil/interface.c

@@ -29,6 +29,18 @@
 #include <string.h>
 #include <wsutil/inet_addr.h>
 
+#ifdef HAVE_SYS_TYPES_H
+    #include <sys/types.h>
+#endif
+
+#ifdef HAVE_SYS_SOCKET_H
+    #include <sys/socket.h>
+#endif
+
+#ifdef HAVE_NETINET_IN_H
+    #include <netinet/in.h>
+#endif
+
 #ifdef HAVE_ARPA_INET_H
     #include <arpa/inet.h>
 #endif
@@ -37,10 +49,6 @@
     #include <ifaddrs.h>
 #endif
 
-#ifdef HAVE_NETINET_IN_H
-    #include <netinet/in.h>
-#endif
-
 GSList *local_interfaces_to_list(void)
 {
     GSList *interfaces = NULL;