Simplified mutexes for systems with no _POSIX_TIMEOUTS.

[SVN r41540]

doc/html/reference.css

@@ -1,3 +1,11 @@
+/*=============================================================================
+    Copyright (c) 2004 Joel de Guzman
+    http://spirit.sourceforge.net/
+
+    Use, modification and distribution is subject to the Boost Software
+    License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+    http://www.boost.org/LICENSE_1_0.txt)
+=============================================================================*/
 PRE.synopsis { 
   background-color: #e0ffff;
   border: thin solid blue;