This functionality is needed according to POSIX. Additionally, some
logic had to be changed in order for the ptsname to be correct for the
manager terminal (ptmx). If you want to obtain a pty, you must go
through the `posix_openpt`-`grantpt`-`unlockpt`-`ptsname`-`open`
process. Alternatively, relibc as a function called `openpty`.
This is part of my ptyd series. This can be safely merged once the MRs
for relibc/ and userutils/ are merged at the same time.
Connor-GH