again 2.8.4 doesn't compile on Windows with opencl enabled

Commenting this code in configure.ac solves the problem

if test "x$AMDAPPSDKROOT" != x; then
OPENCL_FLAGS="-I$AMDAPPSDKROOT/include $OPENCL_FLAGS"
OPENCL_LIBS="-L$AMDAPPSDKROOT/lib/$ARCH_DIR $OPENCL_LIBS"
fi