message: fix in o2 Jamfile flag
diff: @@ -40,11 +40,9 @@ rule libtorrent_linking ( properties * )
  feature iostream : off on : composite propagated link-incompatible ;
  feature.compose <iostream>off : <define>BOOST_NO_IOSTREAM ;
  -feature o2 : on off : composite propagated link-incompatible ;
  -feature.compose <o2>on : <toolset>darwin: <cxxflags>-Oz ;
  -feature.compose <o2>on : <toolset>clang: <cxxflags>-Oz ;
  -feature.compose <o2>on : <toolset>clang-linux: <cxxflags>-Oz ;
  -feature.compose <o2>on : <toolset>gcc: <cxxflags>-Os ;
  +feature o2 : off s1 s2 : composite propagated link-incompatible ;
  +feature.compose <o2>s1 : <cxxflags>-Os ;
  +feature.compose <o2>s2 : <cxxflags>-Oz ;
  feature ssl : on off : composite propagated link-incompatible ;
  feature.compose <ssl>on :
  @@ -61,6 +59,10 @@ lib jlibtorrent
  <conditional>@libtorrent_linking
  <library>/torrent//torrent/<link>static
  <include>.
  + <toolset>darwin:<o2>s2
  + <toolset>clang:<o2>s2
  + <toolset>clang-linux:<o2>s2
  + <toolset>gcc:<o2>s1
  : # default build
  <link>shared
  