Disable ice100 cable driver when libusb is not found

git-svn-id: https://urjtag.svn.sourceforge.net/svnroot/urjtag/trunk@1824 b68d4a1b-bc3d-0410-92ed-d4ac073336b7

urjtag/ChangeLog

@@ -2,6 +2,8 @@
 
   * configure.ac: Add autodetection of inpout32.
 
+  * configure.ac: Disable ice100 cable driver when libusb is not found.
+
 2010-08-11  Mike Frysinger  <vapier@gentoo.org>
 
   * src/tap/cable/ice100.c: Add version check and firmware upgrade information

urjtag/configure.ac

@@ -673,7 +673,7 @@ URJ_DRIVER_SET([cable], [
 		drivers=`echo ${drivers} | $SED -e "s/ft2232//" -e "s/usbblaster//"`
 	])
 	AS_IF([test "x$HAVELIBUSB" = "xno"], [
-		drivers=`echo ${drivers} | $SED -e "s/jlink//" -e "s/xpc//"`
+		drivers=`echo ${drivers} | $SED -e s/jlink// -e s/xpc// -e s/ice100//`
 	])
 ])
 dnl the "fake" jim cable driver is special