[PATCH V4] xserver: check for elevated privileges not uid=0

[Antoine Martin]

This allows us to run the server as a normal user whilst still
being able to use the -modulepath, -logfile and -config switches
We define a xf86PrivsElevated which will do the checks and cache
the result in case it is called more than once.
Also renamed the paths #defines to match their new meaning.
Original discussion which led to this patch can be found here:
http://lists.freedesktop.org/archives/xorg-devel/2011-September/025853.html

Signed-off-by: Antoine Martin <antoine at nagafix.co.uk>


Changes from the previous version of this patch:
* use FatalError() rather than exit() (thx to Julien Cristau)
* remove comment superseded by FatalError message (thx to Tormod Volden)
* more defensive code: print warning and assume privs are elevated if 
getresuid or getresgid fail, ensure all codepaths set privsElevated 
explicitly and make it default to TRUE (in case we ever miss one)
* email title includes patch version in the right location
(btw, there are changes in xserver's autoconf, not just hw/xfree86)

Thanks
Antoine

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