[rfc] _PATH_VARRUN on recent Linux systems (/run)

[Mike Frysinger <vapier at gentoo dot org>]

pretty much all Linux distros have converted to /run and /run/lock (where 
/var/run is a symlink to /run and /var/lock a symlink to /run/lock).  the 
paths.h header defines _PATH_VARRUN to /var/run.

the question: do we care ?  i.e. should we change it to /run to match what
all distros are doing ?  or does the fact that /var/run is guaranteed to
be a valid path to /run sufficient to ignore the issue (and basically say
that it's a moot point) ?
-mike

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