Add lexical_cast to status/Jamfile.v2.

status/Jamfile.v2

@@ -103,6 +103,7 @@ run-tests libs :
     iostreams/test              # test-suite iostreams
     iterator/test               # test-suite iterator
     lambda/test                 # test-suite lambda
+    lexical_cast/test           # test-suite lexical_cast
     local_function/test         # test-suite local_function
     locale/test                 # test-suite locale
     log/test                    # test-suite log