stabilize build system: depends, installer, boost/bdb fixes, cross targets groundwork

depends/x86_64-pc-linux-gnu/include/boost/asio/system_timer.hpp

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+//
+// system_timer.hpp
+// ~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2017 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// 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)
+//
+
+#ifndef BOOST_ASIO_SYSTEM_TIMER_HPP
+#define BOOST_ASIO_SYSTEM_TIMER_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/config.hpp>
+
+#if defined(BOOST_ASIO_HAS_STD_CHRONO) \
+  || defined(BOOST_ASIO_HAS_BOOST_CHRONO) \
+  || defined(GENERATING_DOCUMENTATION)
+
+#if defined(BOOST_ASIO_HAS_STD_CHRONO)
+# include <chrono>
+#elif defined(BOOST_ASIO_HAS_BOOST_CHRONO)
+# include <boost/chrono/system_clocks.hpp>
+#endif
+
+#include <boost/asio/basic_waitable_timer.hpp>
+
+namespace boost {
+namespace asio {
+
+#if defined(GENERATING_DOCUMENTATION)
+/// Typedef for a timer based on the system clock.
+/**
+ * This typedef uses the C++11 @c &lt;chrono&gt; standard library facility, if
+ * available. Otherwise, it may use the Boost.Chrono library. To explicitly
+ * utilise Boost.Chrono, use the basic_waitable_timer template directly:
+ * @code
+ * typedef basic_waitable_timer<boost::chrono::system_clock> timer;
+ * @endcode
+ */
+typedef basic_waitable_timer<chrono::system_clock> system_timer;
+#elif defined(BOOST_ASIO_HAS_STD_CHRONO)
+typedef basic_waitable_timer<std::chrono::system_clock> system_timer;
+#elif defined(BOOST_ASIO_HAS_BOOST_CHRONO)
+typedef basic_waitable_timer<boost::chrono::system_clock> system_timer;
+#endif
+
+} // namespace asio
+} // namespace boost
+
+#endif // defined(BOOST_ASIO_HAS_STD_CHRONO) 
+       //   || defined(BOOST_ASIO_HAS_BOOST_CHRONO)
+       //   || defined(GENERATING_DOCUMENTATION)
+
+#endif // BOOST_ASIO_SYSTEM_TIMER_HPP