externals: Update boost to 1.72 and add Boost Context

boost/winapi/get_current_process_id.hpp

@@ -0,0 +1,30 @@
+/*
+ * Copyright 2010 Vicente J. Botet Escriba
+ *
+ * Distributed under the Boost Software License, Version 1.0.
+ * See http://www.boost.org/LICENSE_1_0.txt
+ */
+
+#ifndef BOOST_WINAPI_GET_CURRENT_PROCESS_ID_HPP_INCLUDED_
+#define BOOST_WINAPI_GET_CURRENT_PROCESS_ID_HPP_INCLUDED_
+
+#include <boost/winapi/basic_types.hpp>
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#pragma once
+#endif
+
+// Windows CE define GetCurrentProcessId as an inline function in kfuncs.h
+#if !defined( BOOST_USE_WINDOWS_H ) && !defined( UNDER_CE )
+extern "C" {
+BOOST_SYMBOL_IMPORT boost::winapi::DWORD_ BOOST_WINAPI_WINAPI_CC GetCurrentProcessId(BOOST_WINAPI_DETAIL_VOID);
+}
+#endif
+
+namespace boost {
+namespace winapi {
+using ::GetCurrentProcessId;
+}
+}
+
+#endif // BOOST_WINAPI_GET_CURRENT_PROCESS_ID_HPP_INCLUDED_