package: don't check GL tests for es2 and es3 targets.

They don't have any windowless application yet, thus the operations are
basically a no-op. AND JENKINS IS SO DAMN SLOW THAT THIS MATTERS.

package/ci/jenkins-gltests.xml

@@ -67,9 +67,7 @@
       <name>gl</name>
       <values>
         <string>desktop</string>
-        <string>es2</string>
         <string>es2desktop</string>
-        <string>es3</string>
         <string>es3desktop</string>
       </values>
     </hudson.matrix.TextAxis>