[ros-dev] gdb stub patch

[Samuel Bronson]

I was poking around in gdbstub.c, trying to get it to work a bit
better. I managed to drastically reduce the time it takes GDB to
attach, among other things, by not trying to send a stop reply packet
(and so not responding to GDB's queries). The only reason it worked
before is that, after all the other replies had timed out a few times
each, it issued a `?' query, and finally interpreted the stop reply
packet as the answer to that... there are some other changes,
hopefully for the better.