Add gmock into our dependencies.

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

Index: third_party/boost/boost/mpl/aux_/config/preprocessor.hpp
diff --git a/third_party/boost/boost/mpl/aux_/config/preprocessor.hpp b/third_party/boost/boost/mpl/aux_/config/preprocessor.hpp
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+++ b/third_party/boost/boost/mpl/aux_/config/preprocessor.hpp
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+
+#ifndef BOOST_MPL_AUX_CONFIG_PREPROCESSOR_HPP_INCLUDED
+#define BOOST_MPL_AUX_CONFIG_PREPROCESSOR_HPP_INCLUDED
+
+// Copyright Aleksey Gurtovoy 2000-2004
+//
+// 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 $
+
+#include <boost/mpl/aux_/config/workaround.hpp>
+
+#if !defined(BOOST_MPL_CFG_BROKEN_PP_MACRO_EXPANSION) \
+    && (   BOOST_WORKAROUND(__MWERKS__, <= 0x3003) \
+        || BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x561)) \
+        || BOOST_WORKAROUND(__IBMCPP__, BOOST_TESTED_AT(502)) \
+        )
+
+#   define BOOST_MPL_CFG_BROKEN_PP_MACRO_EXPANSION
+
+#endif
+
+#if !defined(BOOST_MPL_CFG_NO_OWN_PP_PRIMITIVES)
+#   define BOOST_MPL_CFG_NO_OWN_PP_PRIMITIVES
+#endif
+
+#if !defined(BOOST_NEEDS_TOKEN_PASTING_OP_FOR_TOKENS_JUXTAPOSING) \
+    && BOOST_WORKAROUND(__DMC__, BOOST_TESTED_AT(0x840))
+#   define BOOST_NEEDS_TOKEN_PASTING_OP_FOR_TOKENS_JUXTAPOSING
+#endif
+
+
+#endif // BOOST_MPL_AUX_CONFIG_PREPROCESSOR_HPP_INCLUDED