Move interface-related defines to interfaces.h so we don't have to include

<netinet/in.h> everywhere.

interfaces.c

@@ -70,20 +70,12 @@
 #include <net/if.h>
 
 #include "sudo.h"
-#include "version.h"
+#include "interfaces.h"
 
 #ifndef lint
 static const char rcsid[] = "$Sudo$";
 #endif /* lint */
 
-/*
- * Globals
- */
-struct interface *interfaces;
-int num_interfaces = 0;
-extern int Argc;
-extern char **Argv;
-
 
 #if defined(SIOCGIFCONF) && !defined(STUB_LOAD_INTERFACES)
 /**********************************************************************