Add gmock into our dependencies.

third_party/boost/boost/mpl/aux_/config/gcc.hpp

Index: third_party/boost/boost/mpl/aux_/config/gcc.hpp
diff --git a/third_party/boost/boost/mpl/aux_/config/gcc.hpp b/third_party/boost/boost/mpl/aux_/config/gcc.hpp
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index 0000000000000000000000000000000000000000..18bc4b89b865425a5b232f743e66893e4d1b6add
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+++ b/third_party/boost/boost/mpl/aux_/config/gcc.hpp
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+
+#ifndef BOOST_MPL_AUX_CONFIG_GCC_HPP_INCLUDED
+#define BOOST_MPL_AUX_CONFIG_GCC_HPP_INCLUDED
+
+// Copyright Aleksey Gurtovoy 2004
+//
+// Distributed under 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)
+//
+// See http://www.boost.org/libs/mpl for documentation.
+
+// $Source$
+// $Date: 2004-09-02 11:41:37 -0400 (Thu, 02 Sep 2004) $
+// $Revision: 24874 $
+
+#if defined(__GNUC__) && !defined(__EDG_VERSION__)
+#   define BOOST_MPL_CFG_GCC ((__GNUC__ << 8) | __GNUC_MINOR__)
+#else
+#   define BOOST_MPL_CFG_GCC 0
+#endif
+
+#endif // BOOST_MPL_AUX_CONFIG_GCC_HPP_INCLUDED