[clang] Update cwg960 test to clang 3.0.

https://godbolt.org/z/o77989zM7

Author: bricknerb

clang/test/CXX/drs/cwg9xx.cpp

@@ -93,7 +93,7 @@ struct B : A {
 } // namespace example2
 } // namespace cwg952
 
-namespace cwg960 { // cwg960: 2.8
+namespace cwg960 { // cwg960: 3.0
 struct a {};
 class A {
 #if __cplusplus >= 201103L

clang/www/cxx_dr_status.html

@@ -5579,7 +5579,7 @@ <h2 id="cxxdr">C++ defect report implementation status</h2>
     <td><a href="https://cplusplus.github.io/CWG/issues/960.html">960</a></td>
     <td>CD2</td>
     <td>Covariant functions and lvalue/rvalue references</td>
-    <td class="full" align="center">Clang 2.8</td>
+    <td class="full" align="center">Clang 3.0</td>
   </tr>
   <tr id="961">
     <td><a href="https://cplusplus.github.io/CWG/issues/961.html">961</a></td>