[sledge] Config dune to not wrap executables
[sledge] Config dune to not wrap executables

Summary:
Wrapping executables adds a `Dune__exe__` prefix to module names that
leaks into stack traces, the debugger, and associated tool output.

Reviewed By: bennostein

Differential Revision: D37593404

fbshipit-source-id: 51e32cfcf219004ea9ef9c19f8c49498bc96b585

facebook/infer,facebook/infer,facebook/infer,facebook/infer,facebook/infer,facebook/infer,facebook/infer