File link-with-boost_system.patch of Package moses

diff -rU3 moses-20120409.orig/Jamroot moses-20120409/Jamroot
--- moses-20120409.orig/Jamroot	2012-04-09 12:53:21.000000001 +0100
+++ moses-20120409/Jamroot	2018-01-02 10:01:03.000000001 +0000
@@ -140,6 +140,7 @@
 }
 #See tools/build/v2/contrib/boost.jam in a boost distribution for a table of macros to define.   
 boost_lib thread THREAD_DYN_DLL ;
+boost_lib system THREAD_DYN_DLL ;
 boost_lib program_options PROGRAM_OPTIONS_DYN_LINK ;
 boost_lib unit_test_framework TEST_DYN_LINK ;
 
@@ -183,6 +184,7 @@
 project : requirements 
   <threading>multi:<define>WITH_THREADS
   <threading>multi:<library>boost_thread
+  <threading>multi:<library>boost_system
   <define>_FILE_OFFSET_BITS=64 <define>_LARGE_FILES
   $(requirements)
   <cxxflags>$(cxxflags)