staging: usbip: Fix build on Debian ppc

One missing include was added.
Signed-off-by: NDominik Paulus <dominik.paulus@fau.de>
Signed-off-by: NTobias Polzer <tobias.polzer@fau.de>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/usbip/userspace/src/usbip_network.c

@@ -25,6 +25,10 @@
 #include <netinet/tcp.h>
 #include <unistd.h>
 
+#ifdef HAVE_LIBWRAP
+#include <tcpd.h>
+#endif
+
 #include "usbip_common.h"
 #include "usbip_network.h"