Fixed build warnings on Windows.

libssh/channels1.c

@@ -26,6 +26,9 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <stdio.h>
+#ifndef _WIN32
+#include <arpa/inet.h>
+#endif
 #include "libssh/priv.h"
 #include "libssh/ssh1.h"
 #include "libssh/buffer.h"