[PULL] revert arm backtrace fix, introduce client id tracking

[Pat Kane]

On Wed, Nov 10, 2010 at 4:54 PM, Keith Packard <keithp at keithp.com> wrote:
> Seems like just sticking new fields in the client and having the OS
> initialize them when the client connects would make most of this code
> unnecessary.

Yeah, I have a local hack that uses the 3 pad bytes in xConnClientPrefix
to pass client ID (PID) to the X server.

Pat
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