package/libxml2: bump version to 2.13.3
Add configure option --with-http to enable HTTP support which is now
disabled by default to preserve previous behaviour.
Release notes:
https://download.gnome.org/sources/libxml2/2.13/libxml2-2.13.0.news
https://download.gnome.org/sources/libxml2/2.13/libxml2-2.13.1.news
https://download.gnome.org/sources/libxml2/2.13/libxml2-2.13.2.news
https://download.gnome.org/sources/libxml2/2.13/libxml2-2.13.3.news
Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>