<h3>Contribution description</h3>
<p>While running <code>make distclean</code>, I noticed that <code>tests/pkg_c25519</code> was raising a warning because of <code>test</code> target being redefined.</p>
<p>This PR is removing this target.</p>
<p>I also noticed that the package distclean target is using <code>rm -rf $(PKG_SHAFILE)</code> with <code>$(PKG_SHAFILE)</code> not defined anywhere. This result in a bare call to <code>rm -rf</code> which I find not nice. So this is also removing this (in a separate commit). I can drop this from this PR if there's a good reason to keep it.</p>

<h3>Testing procedure</h3>
<p>A green Murdock should be ok. <code>make -C tests/pkg_c25519 distclean</code> should not raise any warning. No call to <code>rm -rf </code> without parameter is done.</p>

<h3>Issues/PRs references</h3>
<p>None</p>


<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>  <a href='https://github.com/RIOT-OS/RIOT/pull/11427'>https://github.com/RIOT-OS/RIOT/pull/11427</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>tests/pkg_c25519: remove useless test target</li>
  <li>pkg/c25519: remove inexistent SHAFILE cleanup</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/11427/files#diff-0">pkg/c25519/Makefile</a>
    (1)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/11427/files#diff-1">tests/pkg_c25519/Makefile</a>
    (3)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/RIOT-OS/RIOT/pull/11427.patch'>https://github.com/RIOT-OS/RIOT/pull/11427.patch</a></li>
  <li><a href='https://github.com/RIOT-OS/RIOT/pull/11427.diff'>https://github.com/RIOT-OS/RIOT/pull/11427.diff</a></li>
</ul>

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