Add instructions for -U__STRICT_ANSI__ for Mac OS 10.6

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@133616 91177308-0d34-0410-b5e6-96231b3b80d8

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@@ -177,6 +177,12 @@
   <ul>
   <li><code>cd libcxx/test</code></li>
   <li><code>./testit</code></li>
+     <ul>
+       <li><p>On Mac OS 10.6 add "-U__STRICT_ANSI__" to the command line with:</p>
+           <blockquote><pre>
+export OPTIONS="-std=c++0x -stdlib=libc++ -U__STRICT_ANSI__"
+           </pre></blockqutoe></li>
+     </ul>
   </ul>
 
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