[RFC] support -b <baudrate> when starting gdb

[Adrian Chadd]

It wasn't listed anywhere in the documentation / wiki. I only found it
after I had posted that patch.

eg:

http://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kerneldebug-online-gdb.html

I had to do a whole lot of searching to finally discover that particular option.

And yes, it'd be nice to have -b so I can use -b and -r to instantly
open up a remote gdb session.



Adrian