[libvirt] FreeBSD and sysconf(_SC_GETPW_R_SIZE_MAX)

[Matthias Bolte <matthias bolte googlemail com>]

On FreeBSD virsh fails to enter interactive mode because
vshReadlineInit fails, because virGetUserDirectory fails, because
virGetUserEnt fails, because sysconf(_SC_GETPW_R_SIZE_MAX) returns -1
and sets errno to EINVAL.

Is this something that gnulib should/could deal with, Eric?

Or should we work around it in libvrt and fallback to PATH_MAX when
sysconf(_SC_GETPW_R_SIZE_MAX) fails?

Matthias