Turn off Windows again as headers/libs for OpenCL are not yet available on minGW BuildBot even when testing OpenCL. We're looking into fixing that.
Turn off Windows again as headers/libs for OpenCL are not yet
available on minGW BuildBot even when testing OpenCL. We're looking
into fixing that.

psuriana/Halide,kgnk/Halide,kgnk/Halide,psuriana/Halide,kgnk/Halide,psuriana/Halide,psuriana/Halide,kgnk/Halide,psuriana/Halide,kgnk/Halide,kgnk/Halide,kgnk/Halide,psuriana/Halide,psuriana/Halide,kgnk/Halide