Small fix for Linux __opensock

[Ulrich Drepper]

Wolfram Gloger <Wolfram.Gloger@dent.med.uni-muenchen.de> writes:

> Current glibc has failed "make check" for me when run on Linux-2.2.x;
> test_ifindex reported that it couldn't get any interfaces (everything
> is fine on Linux-2.4).  The reason is that ioctl(fd, SIOCGIFCONF...)
> fails on 2.2.x for all AF_UNIX sockets.  So I would suggest that we
> prefer AF_INET in __opensock() just like we did in glibc-2.2.

There is a good reason for the current order but I cannot remember
right now.  I'll have to think more about it.

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