the unpatched c compiler is a bit too lax about embedding
structs that have not been defined (as opposed to ptrs).
this patch just defines DDesc before it is embedded in
Desc.

Reference: /n/sources/patch/applied/libusbuse
Date: Tue Oct 20 21:37:45 CES 2009
Signed-off-by: quanstro@quanstro.net

--- /sys/src/cmd/usb/lib/usb.h	Tue Oct 20 21:36:22 2009
+++ /sys/src/cmd/usb/lib/usb.h	Tue Oct 20 21:36:21 2009
@@ -240,6 +240,14 @@
  * within a configuration.
  * These are unknown to the library but handed to the driver.
  */
+struct DDesc
+{
+	uchar	bLength;
+	uchar	bDescriptorType;
+	uchar	bbytes[1];
+	/* extra bytes allocated here to keep the rest of it */
+};
+
 struct Desc
 {
 	Conf*	conf;		/* where this descriptor was read */
@@ -247,14 +255,6 @@
 	Ep*	ep;		/* last endpt before desc in conf. */
 	Altc*	altc;		/* last alt.c. before desc in conf. */
 	DDesc	data;		/* unparsed standard USB descriptor */
-};
-
-struct DDesc
-{
-	uchar	bLength;
-	uchar	bDescriptorType;
-	uchar	bbytes[1];
-	/* extra bytes allocated here to keep the rest of it */
 };
 
 /*