Add code to use libusb-1.0 asynchronous transfers to fix problem of

occasional missed keys and eliminate use of key_timeout which disrupts the
main loop timing (by M. Jones).

acinclude.m4

@@ -381,6 +381,11 @@ dnl			else
 			if test "$enable_libusb" = yes ; then
 				DRIVERS="$DRIVERS picolcd${SO}"
 				actdrivers=["$actdrivers picolcd"]
+				if test "$enable_libusb_1_0" = yes ; then
+					AC_MSG_RESULT([The picolcd driver is using the libusb-1.0 library.])
+				else
+					AC_MSG_RESULT([The picolcd driver is using the libusb-0.1 library.])
+				fi
 			else
 				AC_MSG_WARN([The picolcd driver needs the libusb library.])
 			fi