Fix autolink in boost-lib.

Jamroot

@@ -288,7 +288,7 @@ rule boost-install ( libraries * )
 rule boost-lib ( name : sources * : requirements * : default-build * : usage-requirements * )
 {
     name = boost_$(name) ;
-    autolink = <link>shared:<define>BOOST_$(name:U)_DYN_LINK=1 ;
+    autolink = <link>shared:<define>$(name:U)_DYN_LINK=1 ;
     lib $(name)
         : $(sources)
         : $(requirements) $(autolink)