[PATCH] linux ttyname and ttyname_r: return link if appropriate

[Serge E. Hallyn]

Hi,

back in april we went through some back and forth on this patch to fix a
behavior in ttyname which broke containers in some setups.  It also now
apparently breaks the package manager dnf in some setups.  The last
email appears to be this one

https://sourceware.org/ml/libc-alpha/2016-04/msg00500.html

I just checked, and the patch still applies cleanly to today's git head. If
there are no further objections could this patch be applied?

thanks,
-serge