Unbreak STLport and railsys test.

* tools/stlport.jam
  (stlport-target-class.generate): New method.

* test/test_all.py: Run 'railsys' again.


[SVN r19242]

tools/build

@@ -1 +1 @@
-Subproject commit b99efeaceacb6880773ab0b3d1bcb05724ba00dc
+Subproject commit ee7194978be3cee7afc37cdc6ed606094b64f473