Make cellspu driver compile again.
Fix a warning with pointer cast in clEnqueueNativeKernel
Merge pull request #13 from clementleger/master

Fix a warning with pointer cast in clEnqueueNativeKernel
Make cellspu kernel library compile again.
Do not enable cellspu driver if not using LLVM 3.2
Fix PPC address_bytes detection on pthreads: Do not use sizeof(void*)
from autoconf macros - $target is not always correct on ppc.