[bug] git clone: -c key=value missed when cloning submodules with --recurse-submodules

Given 2 repositories, the 1st is "parent", with the 2nd as a submodule:

* https://remote.host/parent
* https://remote.host/submodule

When cloning the parent repo with the below command:

    git clone -c key=value --recurse-submodules https://remote.host/parent

While "-c key=value" is properly applied when cloning the parent, it's missed when cloning the submodule.

Here the actual key/value is something like "url.new.insteadOf=old" for authentication purpose.

Fortunately the following works:

    git -c key=value clone --recurse-submodules https://remote.host/parent

Ideally the first form should also work.