GDB: Drop ``remote cisco'' support

[Andrew Cagney]

> Hello,
> 
> GDB currently includes support for debugging a remote program using the a set of extensions to GDB's remote protocol (commonly known as cisco remote).
> 
> It has been proposed that support for these specific protocol extension be dropped from GDB.
> 
> If anyone has comments or problems with this then please contact the gdb developers (CC'd).

I got a question asking exactly what is different.  Off the top of my head:

- When connecting, the cisco target assumes the remote end is running 
and just waits for it to stop.  The idea definitly sound. Need to 
integrate this into the current targets though.

- Some additional stop responses to do with relocations

- A telnet like command.  It relies on both ends ignoring line noise.

enjoy,
Andrew