Add gmock into our dependencies.

third_party/boost/boost/config/compiler/sgi_mipspro.hpp

Index: third_party/boost/boost/config/compiler/sgi_mipspro.hpp
diff --git a/third_party/boost/boost/config/compiler/sgi_mipspro.hpp b/third_party/boost/boost/config/compiler/sgi_mipspro.hpp
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index 0000000000000000000000000000000000000000..33e97e9af3d53c681fd53d79a375197465705db5
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+++ b/third_party/boost/boost/config/compiler/sgi_mipspro.hpp
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+//  (C) Copyright John Maddock 2001 - 2002. 
+//  Use, modification and distribution are 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)
+
+//  See http://www.boost.org for most recent version.
+
+//  SGI C++ compiler setup:
+
+#define BOOST_COMPILER "SGI Irix compiler version " BOOST_STRINGIZE(_COMPILER_VERSION)
+
+#include "boost/config/compiler/common_edg.hpp"
+
+//
+// Threading support:
+// Turn this on unconditionally here, it will get turned off again later
+// if no threading API is detected.
+//
+#define BOOST_HAS_THREADS
+#define BOOST_NO_TWO_PHASE_NAME_LOOKUP
+
+#undef BOOST_NO_SWPRINTF
+#undef BOOST_DEDUCED_TYPENAME
+//
+// version check:
+// probably nothing to do here?
+
+