[libvirt] [PATCH]: don't harcode buffer for getgrnam_r

[Guido Günther]

Hi,
determines the maximum needed buffersize for getgrnam_r using sysconf
instead of hardcoding it to 1024 and increases the buffer on ERANGE.
The latter is needed since sysconf is allowed to return -1. Furthermore
some glibc versions seem to return a too small buffer on amd64
(http://bugs.debian.org/520744). O.k. to apply?
Cheers,
 -- Guido
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