updated OpenCL headers

[Stephan]

On 26.07.2010 00:57, Trass3r wrote:
>> cool, thanks for the updates
>
> Made substantial further changes.
> Which platform are you working on? If it is non-Windows please report
> whether it works.
> If you write sample code using cl4d resp. the underlying bindings please
> also submit to me (via bitbucket).

i just tested it to build on windows and it does not build at all (dmd 
2047):

opencl\program.d(107): Error: forward reference to 
'CLObjectCollection(cl_device_id)'
opencl\program.d(107): Error: CLDevices is used as a type