docs: remove automatic testing from help wanted

Intel has a Jenkins setup and has made the various scripts and
documentation open source.

https://github.com/janesma/mesa_jenkins

Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>

docs/helpwanted.html

@@ -40,12 +40,6 @@ Fixing MSVC builds.
 <li>
 <b>Contribute more tests to
 <a href="https://piglit.freedesktop.org/">Piglit</a>.</b>
-<li>
-<b>Automatic testing.
-</b>
-It would be great if someone would set up an automated system for grabbing
-the latest Mesa code and run tests (such as piglit) then report issues to
-the mailing list.
 </ol>
 
 <p>