package/ca-certificates: generate the bundle of certs

glib-networking wants to use the certificates bundle, not the individual
certificates.

Generating the bundle is usually done with update-ca-certificates, but
that does not support running out-of-tree.

Fortiunately, and as Gustavo put it, update-ca-certificates is jsut a
glorified 'cat'. It is supposed to be fed a config file stating which
certificate to add/remove to/from the bundle, otherwise nothing fancy
(Oh, yes, running hooks after updating the bundle).

Since we do not need any of this in Buidlroot, we jsut generate a bundle
with all certificates unconditionally.

Reported-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Gustavo Zacarias <gustavo@zacarias.com.ar>
Acked-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Tested-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>