Add -Wall -Werror to the CMake build so that it matches the Makefile build
Add -Wall -Werror to the CMake build so that it matches the Makefile build


Former-commit-id: 36878fe6e80bc32c803eda14b5fb7194e688f2ee
darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide