<h3>Contribution description</h3>
<p>Due to <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="497846825" data-permission-text="Issue title is private" data-url="https://github.com/RIOT-OS/RIOT/issues/12300" data-hovercard-type="pull_request" data-hovercard-url="/RIOT-OS/RIOT/pull/12300/hovercard" href="https://github.com/RIOT-OS/RIOT/pull/12300">#12300</a> <code>dst</code> and <code>dst_len</code> become unused in the VRB. This PR re-uses these members instead of the members <code>out_dst</code> and <code>out_dst_len</code> of the VRB (and deletes those members).</p>
<p>While technically an API change, the member is only used internally (and checked by the tests) when disregarding <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="414640378" data-permission-text="Issue title is private" data-url="https://github.com/RIOT-OS/RIOT/issues/11068" data-hovercard-type="pull_request" data-hovercard-url="/RIOT-OS/RIOT/pull/11068/hovercard" href="https://github.com/RIOT-OS/RIOT/pull/11068">#11068</a>.</p>

<h3>Testing procedure</h3>
<p><code>tests/unittests</code> should still run, spefically <code>tests-gnrc_sixlowpan_frag_vrb</code>.</p>

<h3>Issues/PRs references</h3>
<p>Depends on <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="497846825" data-permission-text="Issue title is private" data-url="https://github.com/RIOT-OS/RIOT/issues/12300" data-hovercard-type="pull_request" data-hovercard-url="/RIOT-OS/RIOT/pull/12300/hovercard" href="https://github.com/RIOT-OS/RIOT/pull/12300">#12300</a> and <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="499754349" data-permission-text="Issue title is private" data-url="https://github.com/RIOT-OS/RIOT/issues/12324" data-hovercard-type="pull_request" data-hovercard-url="/RIOT-OS/RIOT/pull/12324/hovercard" href="https://github.com/RIOT-OS/RIOT/pull/12324">#12324</a>.</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/12325'>https://github.com/RIOT-OS/RIOT/pull/12325</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>gnrc_sixlowpan_frag_vrb: fix for draft update</li>
  <li>tests: unittests: adapt 6LoWPAN VRB tests</li>
  <li>tests: unittests: remove duplicate `static const`s from VRB tests</li>
  <li>gnrc_sixlowpan_frag: move private RB functions to RB module</li>
  <li>gnrc_sixlowpan_frag_rb: remove public around former private functions</li>
  <li>gnrc_sixlowpan_frag_rb: use existing name scheme for private functions</li>
  <li>gnrc_sixlowpan_frag_rb: remove legacy defines</li>
  <li>gnrc_sixlowpan_frag_rb: unify naming scheme</li>
  <li>gnrc_sixlowpan_frag_rb: make NOPs dependent on RB</li>
  <li>Merge branch 'gnrc_sixlowpan_frag_vrb/fix/index' into gnrc_sixlowpan_frag_rb/cleanup/base-type</li>
  <li>Merge branch 'gnrc_sixlowpan_frag/enh/rbuf-rework202' into gnrc_sixlowpan_frag_rb/cleanup/base-type</li>
  <li>gnrc_sixlowpan_frag_vrb: re-use now unused super::dst for out_dst</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/12325/files#diff-0">Makefile.dep</a>
    (3)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/12325/files#diff-1">sys/include/net/gnrc/sixlowpan.h</a>
    (13)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/12325/files#diff-2">sys/include/net/gnrc/sixlowpan/config.h</a>
    (2)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/12325/files#diff-3">sys/include/net/gnrc/sixlowpan/frag/rb.h</a>
    (101)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/12325/files#diff-4">sys/include/net/gnrc/sixlowpan/frag/vrb.h</a>
    (37)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/12325/files#diff-5">sys/include/net/gnrc/sixlowpan/iphc.h</a>
    (2)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/12325/files#diff-6">sys/net/gnrc/network_layer/sixlowpan/frag/gnrc_sixlowpan_frag.c</a>
    (5)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/12325/files#diff-7">sys/net/gnrc/network_layer/sixlowpan/frag/rb/gnrc_sixlowpan_frag_rb.c</a>
    (439)
  </li>
  <li>
    <strong>D</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/12325/files#diff-8">sys/net/gnrc/network_layer/sixlowpan/frag/rbuf.c</a>
    (436)
  </li>
  <li>
    <strong>D</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/12325/files#diff-9">sys/net/gnrc/network_layer/sixlowpan/frag/rbuf.h</a>
    (116)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/12325/files#diff-10">sys/net/gnrc/network_layer/sixlowpan/frag/vrb/gnrc_sixlowpan_frag_vrb.c</a>
    (44)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/12325/files#diff-11">sys/net/gnrc/network_layer/sixlowpan/gnrc_sixlowpan.c</a>
    (2)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/12325/files#diff-12">sys/net/gnrc/network_layer/sixlowpan/iphc/gnrc_sixlowpan_iphc.c</a>
    (8)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/12325/files#diff-13">tests/gnrc_sixlowpan_frag/Makefile</a>
    (3)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/12325/files#diff-14">tests/gnrc_sixlowpan_frag/main.c</a>
    (137)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/12325/files#diff-15">tests/unittests/tests-gnrc_sixlowpan_frag_vrb/tests-gnrc_sixlowpan_frag_vrb.c</a>
    (206)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/RIOT-OS/RIOT/pull/12325.patch'>https://github.com/RIOT-OS/RIOT/pull/12325.patch</a></li>
  <li><a href='https://github.com/RIOT-OS/RIOT/pull/12325.diff'>https://github.com/RIOT-OS/RIOT/pull/12325.diff</a></li>
</ul>

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