ptsname_r

[Eric Blake]

Since ptsname() is not thread-safe on all platforms, it would be nice if 
cygwin could also export ptsname_r() to match glibc.

If no one beats me to it, I'll try and submit patches this week.

-- 
Eric Blake   eblake@redhat.com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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