At least XP guest dot authenticated on the network ok.
The message box "Loading your personal settings..." appears to be sitting on
the screen forever, but this is probably unrelated to your pcap patch.
$ git diff
diff --git a/net.c b/net.c
index e4b3740..ff2cc14 100644
--- a/net.c
+++ b/net.c
@@ -94,10 +94,10 @@
#endif
#if defined(CONFIG_PCAP)
-#include <pcap.h>
#ifdef _WIN32
-#include <remote-ext.h>
+#define HAVE_REMOTE
#endif /* _WIN32 */
+#include <pcap.h>
#endif /* CONFIG_PCAP */
#if defined(__OpenBSD__)