removed CDT 8.8.1 from update site as discussed in #321

Author: jantje

it.baeyens.arduino.product/arduino.product

@@ -359,7 +359,6 @@ rights to a jury trial in any resulting litigation.</p>
       <repository location="http://download.eclipse.org/eclipse/updates/4.5" enabled="true" />
       <repository location="http://eclipse.baeyens.it/nightly" enabled="false" />
       <repository location="http://eclipse.baeyens.it/V3" enabled="true" />
-      <repository location="http://download.eclipse.org/tools/cdt/releases/8.8.1" enabled="true" />
    </repositories>
 
    <preferencesInfo>