KDB 4.1 USB keyboard fix

[Steven Dake]

KDB 4.1 on the project page for 2.4.20 will not compile against 2.4.20 
with USB keyboard enabled.

Some types were changed (urb_t removed in favor of just struct urb) and 
it looks like functions were moved, creating implicit declarations and 
all the badness that follows.  There are also three unused variables 
that were removed.

The attached patch gets it to compile.

Thanks
-steve
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