Misc: Use the UNREFERENCED_PARAMETER macro for UNUSED when available

This will squelch compiler warnings if platform headers provide this.

Signed-off-by: Chris Dickens <christopher.a.dickens@gmail.com>

libusb/libusbi.h

@@ -91,7 +91,11 @@ extern "C" {
 #define USBI_LOG_LINE_END	"\n"
 
 /* The following is used to silence warnings for unused variables */
-#define UNUSED(var)		do { (void)(var); } while(0)
+#if defined(UNREFERENCED_PARAMETER)
+#define UNUSED(var)	UNREFERENCED_PARAMETER(var)
+#else
+#define UNUSED(var)	do { (void)(var); } while(0)
+#endif
 
 #if !defined(ARRAYSIZE)
 #define ARRAYSIZE(array) (sizeof(array) / sizeof(array[0]))

libusb/version_nano.h

@@ -1 +1 @@
-#define LIBUSB_NANO 11437
+#define LIBUSB_NANO 11438