Missing includes; required at least for compiling against musl.

diff --git a/pcap-usb-linux.c.orig b/pcap-usb-linux.c
index 6f8adf6..a1aa576 100644
--- a/pcap-usb-linux.c.orig
+++ b/pcap-usb-linux.c
@@ -45,6 +45,7 @@
 #include "strerror.h"
 #endif

+#include <limits.h> /* NAME_MAX */
 #include <ctype.h>
 #include <errno.h>
 #include <stdlib.h>