[Buildroot] [patch] to use DISABLE_IPV6 instead of fix seting

[Claus Klein]

Hi all,

while working on a new rootfile system with ipv6 support, I had problems 
with some packages.
By the way there was an  too error in the libxml2 makefile when 
installing the target-header.

Is it documented how makefiles should be written to be flexible for 
differrent toolchain options like:

libintl,
largefile,
ipv6,
...

Here is my patch

ck

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