[Xcb] Get rid of PATH_MAX and MAXPATHLEN

[Peter Harris]

On 2010-04-26 10:36, Peter Harris wrote:
> PS: The Hurd isn't even trying to be POSIX if it doesn't define PATH_MAX
> to 256 or more in limits.h

Ignore this bit please.

Upon closer inspection, the POSIX spec allows an implementation to omit
PATH_MAX under some circumstances.

Peter Harris
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