mac-command-key-is-meta on non-mac systems

[Matan Ninio]

I'm now working on both a mac laptop and a gnu/linux desktop system, and
I pull the emacs session from the desktop to my laptop for work.  This
means I run the linux variant on the Mac screen/keyboard.  There is a
small problem with running emacs on macintosh keyboards which is
solvable via setting the mac-command-key-is-meta variable.  But this
variable is only defined on emacsen that where compiled on/for
Macintosh!
As this is a feature of the client and not the server, perhaps this
could should be part of all emacs and not just the mac ones? 
-- 
Matan Ninio             
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