`git clone -h` does not contain "--depth"

[Benno Schulenberg]

Hi,

In build-aux/bootstrap there is this fragment of code:

    if git clone -h 2>&1 | grep -- --depth > /dev/null; then
        shallow='--depth 2'
    fi

But the output of `git clone -h` nowadays (version 2.48.1) does
not contain the option --depth.  It instead contains this:

    --[no-]depth <depth>  create a shallow clone of that depth

Meaning that the clone will always be full, instead of shallow as
seemingly was intended.


Benno

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