package/perl-libwww-perl: Move package/perl-libwww to new package

This move is necessary to sync the package with scancpan output
as suggested by Francois.
http://lists.busybox.net/pipermail/buildroot/2015-April/126406.html



Since perl-libwww was never part of any official buildroot release
I did not bother the include legavy handling of its options ;)

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>