ifconfig.test: disable the pointopoint tests.

These tests don't work for me as root on either my Debian desktop or my
Android devices. The original mail thread implies that they were as
close as the original comitter could get to _something_ that seemed to
work, even if the kernel doesn't seem to bother with this:

toybox ifconfig *is* missing support for `-pointtopoint` and
`pointopoint` (without an addess), similar for `broadcast` according to
the man page. But since we don't appear to have a way to test this (other
than looking at strace output!) I'm leaning towards YAGNI anyway...
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