repo.or.cz already redirects HTTP requests to HTTPS. There is therefore
no possible benefit to keeping the submodule URLs using HTTP—anyone who
can’t access via HTTPS will fail anyway, immediately after the redirect.
Changing the submodule URLs eliminates one unnecessary HTTP request and,
more importantly, eliminates SSLStrip-style attacks.
Signed-off-by: Christopher Head <email@example.com>
Reviewed-by: Antonio Borneo <firstname.lastname@example.org>
Reviewed-by: Tomas Vanek <email@example.com>