<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=http://email.email.llvm.org/c/eJylkdtuwyAMhp8muUGNCOR4wcXWqu_BwSReaYiA9PD2o9Gm7n6SZcuy9fuzrbx5ijM-SPJEOufvRG3oDC4Tcai25Y6LIXdMM_HOQMht3ulZ4hILdiT3GQIQDamayVU-yeITUUDkTaKTykFV0FNBP348O-vcH56HFfWFMMPA8qFRzHbQMw5G9SM3dLAtg942Ro-NklyWRnAz8lGWckuzD2LBC-pyC07MKa2x4C_lbFOm3FSl_TUnzt1-w2EN_gt0yinGuEEmP7cNZUM5C9aYAera2HbglEoKCqSR0AP0XUs7XeY1wEVRtJ8FYwEcyAh5opL6svqQNVnRnsr_o6BglL2M12M7NnU1GAtdXfcdVRa0pkVD4ZrPWr10Kh-mMohdUm1TzEWHMcV3UcaI0wKwk2fChMmBOP65__u9-8eJxUe5Q4md6BuDCa8_>54028</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Cherry-pick libunwind build fix
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            release:backport
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          nikic
      </td>
    </tr>
</table>

<pre>
    Fix to allow building libunwind with older toolchains, where cet.h may not be available.

/cherry-pick 2d2ef384b2f6e723edb793d08f52e7f4dc94ba3a
</pre>
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