Make arping compile on Windows again about arping

[ThomasHabets]

Backup of an old patch:

--- ../../download/arping-2.06/arping-2/arping.c    2007-09-13 12:43:38.000000000 -0400
+++ arping.c    2007-09-15 15:02:36.031250000 -0400
@@ -49,14 +49,20 @@
 #endif

 #ifdef WIN32
-#include <win32/libnet.h>
+#include <libnet.h>
+#ifndef HAVE_GETGID
+#define getgid() 0
+#endif
+#ifndef HAVE_GETUID
+#define getuid() 0
+#endif
 #endif
 #include <pcap.h>

 #if defined(WIN32)
 #define HAVE_ESIZE_TYPES 1
-#include "win32.h"
-#include "win32/getopt.h"
+//#include "win32.h"
+#include <getopt.h>
 #endif

 #if !defined(linux)
@@ -762,7 +768,7 @@
               tv.tv_sec--;
               tv.tv_usec += 1000000;
           }
-          usleep(10);
+          Sleep(10);
           if (tv.tv_sec < 0) {
               done=1;
           }
@@ -844,7 +850,7 @@
               break;
           default: {
 #else
-          usleep(10);
+          Sleep(10);
           {{
 #endif
               int ret;
@@ -852,8 +858,8 @@
                             func,
                             NULL))) {
                   // rest, so we don't take 100% CPU... mostly
-                  // hmm... does usleep() exist everywhere?
-                  usleep(10);
+                  // hmm... does Sleep() exist everywhere?
+                  Sleep(10);
 #ifndef HAVE_WEIRD_BSD
                   // weird is normal on bsd :)
                   if (verbose) {