<p>Riot lags some way to declare, that a function parameter<br>
is unused. This commit adds a file called "unused.h",<br>
which defines some nice macros.</p>

<p><a href="http://stackoverflow.com/questions/3599160/unused-parameter-warnings-in-c-code">http://stackoverflow.com/questions/3599160/unused-parameter-warnings-in-c-code</a></p>

<p>this commit fixes <a href="https://github.com/RIOT-OS/RIOT/issues/62" class="issue-link" title="low hanging warnings fruits">#62</a> (the discussion wasn't finally over in this issue)</p>

<hr>

<h4>You can merge this Pull Request by running</h4>
<pre>  git pull https://github.com/mehlis/RIOT unused-parameter-macro</pre>
<p>Or view, comment on, or merge it at:</p>
<p>  <a href='https://github.com/RIOT-OS/RIOT/pull/72'>https://github.com/RIOT-OS/RIOT/pull/72</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>add way to declare parameter as unused</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>A</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/72/files#diff-0">core/include/unused.h</a>
    (22)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/72/files#diff-1">core/mutex.c</a>
    (9)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/72/files#diff-2">core/oneway_malloc.c</a>
    (4)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/72/files#diff-3">cpu/native/hwtimer_cpu.c</a>
    (3)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/72/files#diff-4">cpu/native/irq_cpu.c</a>
    (3)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/72/files#diff-5">cpu/native/rtc/posix-rtc.c</a>
    (3)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/72/files#diff-6">sys/shell/commands/sc_ltc4150.c</a>
    (6)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/72/files#diff-7">sys/shell/commands/sc_ps.c</a>
    (4)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/RIOT-OS/RIOT/pull/72/files#diff-8">sys/vtimer/vtimer.c</a>
    (6)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/RIOT-OS/RIOT/pull/72.patch'>https://github.com/RIOT-OS/RIOT/pull/72.patch</a></li>
  <li><a href='https://github.com/RIOT-OS/RIOT/pull/72.diff'>https://github.com/RIOT-OS/RIOT/pull/72.diff</a></li>
</ul>