Comment 11 for bug 1057526

Another approach can be found at:

http://pkgs.fedoraproject.org/cgit/glibc.git/plain/glibc-fedora-gai-canonical.patch

which completely avoids the gethostbyname2_r path if AI_CANONNAME is requested, and also rips out the code to use gethostbyaddr_r for canonname. Although that change is much more invasive than my candidate fix, it has received more testing.