9c8ae96f25
base64url is not called directly in ejabberd code since e227940,
it is only required by p1_acme and erlang-jose 1.11.1
erlang-jose 1.11.1 defines base64url dependency as an hex package,
and rebar2 is not able to download it.
For that reason, when compiling ejabberd with rebar2,
we provide a rebar2-friendly base64url dependency definition.
That way when jose is downloaded, that dependency is already available.