Jamfile fixes for the python bindings to work with system installed boost libraries

bindings/python/Jamfile

@@ -2,6 +2,25 @@ import python ;
 
 use-project /torrent : ../.. ;
 
+# rule for linking the correct libraries depending
+# on features and target-os
+rule linking ( properties * )
+{
+	local result ;
+	if <boost>system in $(properties)
+	{
+		result += <library>boost_python ;
+	}
+
+	if <boost>source in $(properties)
+	{
+		result += <library>/boost/python//boost_python ;
+	}
+	return $(result) ;
+}
+
+lib boost_python : : <name>boost_python $(library-search-path) ;
+
 python-extension libtorrent 
   : src/module.cpp
     src/big_number.cpp
@@ -24,7 +43,7 @@ python-extension libtorrent
     src/peer_info.cpp
     src/ip_filter.cpp
     /torrent//torrent
-    /boost/python//boost_python
   : <include>src
+  : <conditional>@linking
   ;