title: YouCompleteMe doesn't show errors when non standard header is included
body: <p>When I try include gst.h YCM start innoring all error</p>
  
  <p>For example:</p>
  
  <pre><code>#include &lt;math.h&gt;
  //#include &lt;gst/gst.h&gt;
  
  main (){ //ycm show error here
  int a=0;
  int b    //and here
  }
  </code></pre>
  
  <p>but</p>
  
  <pre><code>#include &lt;math.h&gt;
  #include &lt;gst/gst.h&gt;
  
  main (){ //ycm don't show error here
  int a=0;
  int b    //and here
  }
  </code></pre>
  
  <p>path to gst.h included to .ycm_extra_conf.py . What i miss?</p>