[xml] libxml2 on AIX 5.3, ss_family vs. __ss_family

[Hans Rosenfeld <rosenfeld grumpf hope-2000 org>]

When trying to build libxml2 2.6.26 on AIX 5.3, I get the following
error:

nanoftp.c: In function `xmlNanoFTPGetConnection':
nanoftp.c:1382: error: structure has no member named `__ss_family'
nanoftp.c:1401: error: structure has no member named `__ss_family'
nanoftp.c:1432: error: structure has no member named `__ss_family'
nanoftp.c:1469: error: structure has no member named `__ss_family'
nanoftp.c:1488: error: structure has no member named `__ss_family'

Note that this is the exact opposite to
http://bugzilla.gnome.org/show_bug.cgi?id=150836

I think I have seen some changes to configure.in to check this, so the
#ifdef _AIX stuff in nanoftp.c may be unnecessary (and, in this case,
wrong).


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