Add gmock into our dependencies.

third_party/boost/boost/config/select_platform_config.hpp

Index: third_party/boost/boost/config/select_platform_config.hpp
diff --git a/third_party/boost/boost/config/select_platform_config.hpp b/third_party/boost/boost/config/select_platform_config.hpp
new file mode 100644
index 0000000000000000000000000000000000000000..a4c7ad6a87616558e654d472012026ade73b1436
--- /dev/null
+++ b/third_party/boost/boost/config/select_platform_config.hpp
@@ -0,0 +1,90 @@
+//  Boost compiler configuration selection header file
+
+//  (C) Copyright John Maddock 2001 - 2002. 
+//  (C) Copyright Jens Maurer 2001. 
+//  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.
+
+// locate which platform we are on and define BOOST_PLATFORM_CONFIG as needed.
+// Note that we define the headers to include using "header_name" not
+// <header_name> in order to prevent macro expansion within the header
+// name (for example "linux" is a macro on linux systems).
+
+#if defined(linux) || defined(__linux) || defined(__linux__)
+// linux:
+#  define BOOST_PLATFORM_CONFIG "boost/config/platform/linux.hpp"
+
+#elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
+// BSD:
+#  define BOOST_PLATFORM_CONFIG "boost/config/platform/bsd.hpp"
+
+#elif defined(sun) || defined(__sun)
+// solaris:
+#  define BOOST_PLATFORM_CONFIG "boost/config/platform/solaris.hpp"
+
+#elif defined(__sgi)
+// SGI Irix:
+#  define BOOST_PLATFORM_CONFIG "boost/config/platform/irix.hpp"
+
+#elif defined(__hpux)
+// hp unix:
+#  define BOOST_PLATFORM_CONFIG "boost/config/platform/hpux.hpp"
+
+#elif defined(__CYGWIN__)
+// cygwin is not win32:
+#  define BOOST_PLATFORM_CONFIG "boost/config/platform/cygwin.hpp"
+
+#elif defined(_WIN32) || defined(__WIN32__) || defined(WIN32)
+// win32:
+#  define BOOST_PLATFORM_CONFIG "boost/config/platform/win32.hpp"
+
+#elif defined(__BEOS__)
+// BeOS
+#  define BOOST_PLATFORM_CONFIG "boost/config/platform/beos.hpp"
+
+#elif defined(macintosh) || defined(__APPLE__) || defined(__APPLE_CC__)
+// MacOS
+#  define BOOST_PLATFORM_CONFIG "boost/config/platform/macos.hpp"
+
+#elif defined(__IBMCPP__) || defined(_AIX)
+// IBM
+#  define BOOST_PLATFORM_CONFIG "boost/config/platform/aix.hpp"
+
+#elif defined(__amigaos__)
+// AmigaOS
+#  define BOOST_PLATFORM_CONFIG "boost/config/platform/amigaos.hpp"
+
+#elif defined(__QNXNTO__)
+// QNX:
+#  define BOOST_PLATFORM_CONFIG "boost/config/platform/qnxnto.hpp"
+
+#else
+
+#  if defined(unix) \
+      || defined(__unix) \
+      || defined(_XOPEN_SOURCE) \
+      || defined(_POSIX_SOURCE)
+
+   // generic unix platform:
+
+#  ifndef BOOST_HAS_UNISTD_H
+#     define BOOST_HAS_UNISTD_H
+#  endif
+
+#  include <boost/config/posix_features.hpp>
+
+#  endif
+
+#  if defined (BOOST_ASSERT_CONFIG)
+      // this must come last - generate an error if we don't
+      // recognise the platform:
+#     error "Unknown platform - please configure and report the results to boost.org"
+#  endif
+
+#endif
+
+
+