* opencl-lang.c (STRUCT_OCL_TYPE): Remove.
    	(struct builtin_opencl_type): Remove.
    	(builtin_opencl_type): Change return type to "struct type **".
    	(lookup_opencl_vector_type): Update caller.
    	(opencl_language_arch_info): Copy primitive type vector from gdbarch.
    	(build_opencl_types): Install plain array of "struct type *"
    	instead of "struct builtin_opencl_type".