Fix for Issue about config-link-test. Added some code for making sure BOOST_NO_EXCEPTIONS is defined if it needs to be.

test/Jamfile.v2

@@ -92,6 +92,7 @@ test-suite config
           : #input-files
           : #requirements
           <runtime-link>shared
+          <threading>single
           <define>BOOST_DYN_LINK=1
           <define>BOOST_CONFIG_NO_LIB=1
           <target-os>vxworks:<link>shared