compiler note about ABI being changed in GCC 4.6

when using a cl_ulong4, the following compiler note shows up:
```
/home/rabijl/Projects/pocl-2/pocld/../include/hpp/CL/opencl.hpp: In member function ‘cl_int cl::CommandQueue::enqueueFillBuffer(const cl::Buffer&, PatternType, cl::size_type, cl::size_type, cl::vector*, cl::Event*) const [with PatternType = cl_ulong4]’:
/home/rabijl/Projects/pocl-2/pocld/../include/hpp/CL/opencl.hpp:7679:12: note: the ABI for passing parameters with 32-byte alignment has changed in GCC 4.6
7679 | cl_int enqueueFillBuffer(
| ^~~~~~~~~~~~~~~~~
```

Inspect include/hpp/CL/opencl.hpp around line 7679 and reproduce the cl_ulong4 enqueueFillBuffer build with GCC 4.6. Determine whether the ABI note indicates a real compatibility problem or an expected compiler diagnostic, and document the confirmed resolution or required change.

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