t5510: verify that D/F confusion cannot lead to an RCE

The most critical vulnerabilities in Git lead to a Remote Code Execution
("RCE"), i.e. the ability for an attacker to have malicious code being
run as part of a Git operation that is not expected to run said code,
such has hooks delivered as part of a `git clone`.

A couple of parent commits ago, a bug was fixed that let Git be confused
by the presence of a path `a-` to mistakenly assume that a directory
`a/` can safely be created without removing an existing `a` that is a
symbolic link.

This bug did not represent an exploitable vulnerability on its
own; Let's make sure it stays that way.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

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