Fix a test when g++ is not available.

theano/tests/record.py

@@ -126,7 +126,7 @@ class RecordMode(Mode):
             handle_line(line, i, node, fn)
 
         #linker = theano.gof.OpWiseCLinker()
-        linker = theano.gof.vm.VM_Linker(use_cloop=True)
+        linker = theano.gof.vm.VM_Linker(use_cloop=bool(theano.config.cxx))
 
         wrap_linker = theano.gof.WrapLinkerMany([linker], [callback])
         super(RecordMode, self).__init__(wrap_linker, optimizer='fast_run')