Rearrange some headers to make sure that out nbase errno defines are seen early,

avoiding warning about symbol redefinitions. This is mostly moving "nmap.h" to
the top of the list.

services.cc

@@ -90,15 +90,16 @@
 
 /* $Id$ */
 
-#include <list>
-#include <map>
-
+#include "nmap.h"
 #include "services.h"
 #include "NmapOps.h"
 #include "charpool.h"
 #include "nmap_error.h"
 #include "utils.h"
 
+#include <list>
+#include <map>
+
 /* This structure is the key for looking up services in the
    port/proto -> service map. */
 struct port_spec {