script/scancpan: add -host & -target options

Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
perl: skip some tests which need the toolchain
perl: skip one test for DynaLoader
perl: check date in harness
perl-cross: testpack
qemu: add a Config.in.host

after the removal of cpanminus
perl-curses: new package
perl-net-ssleay: new package
libxml-libxml-perl: new package

and its CPAN dependencies