Simplify HalideGenerator.cmake
Simplify HalideGenerator.cmake

— Windows case shouldn’t be necessary any more since generators output
static libraries which we can handle genetically
— Simplify Xcode special-casing to be more targeted

jiawen/Halide,kgnk/Halide,psuriana/Halide,ronen/Halide,jiawen/Halide,jiawen/Halide,jiawen/Halide,kgnk/Halide,ronen/Halide,ronen/Halide,kgnk/Halide,jiawen/Halide,psuriana/Halide,kgnk/Halide,kgnk/Halide,ronen/Halide,psuriana/Halide,kgnk/Halide,psuriana/Halide,ronen/Halide,kgnk/Halide,jiawen/Halide,jiawen/Halide,psuriana/Halide,ronen/Halide,kgnk/Halide,ronen/Halide,psuriana/Halide,ronen/Halide,psuriana/Halide