Separate usb device handle from usb device. (deprecate)

third_party/libusb/src/libusb/core.c

Index: third_party/libusb/src/libusb/core.c
diff --git a/third_party/libusb/src/libusb/core.c b/third_party/libusb/src/libusb/core.c
index a91c77b968635ca8233b17c89b3b2607c52c5001..5512bd8c9b5073fc151c10d0da9b3b3b8534d065 100644
--- a/third_party/libusb/src/libusb/core.c
+++ b/third_party/libusb/src/libusb/core.c
@@ -1664,6 +1664,15 @@ void API_EXPORTED libusb_exit(struct libusb_context *ctx)
 	free(ctx);
 }
 
+/*
+ * Interrupt libusb_handle_events_timeout_completed.
+ */
+void API_EXPORTED libusb_send_event(struct libusb_context *ctx) {
+  unsigned char dummy = 1;
+  USBI_GET_CONTEXT(ctx);
+  usbi_write(ctx->ctrl_pipe[1], &dummy, sizeof(dummy));
+}
+
 /** \ingroup misc
  * Check if the running library has a given capability.
  *