Clean up main myocamlbuild.ml
Clean up main myocamlbuild.ml

Former-commit-id: 0233da36124c6720929098c78a15671102d83e3d
darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide