perl: fix on uClibc without IPv6 support

Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
perl-cross: skip some tests which need the toolchain
perl-cross: tweak harness
perl-cross: bump to version 0.8.3
perl-cross: patch useless with 0.8.3
qemu: bump to version 1.6.1