OpenCL detection

OpenCL (the externallibraries thorn) so far only contains some pretty hard-coded logic for Mac installations and also now breaks (aborts) if OpenCL is compiled, but OPENCL_DIR was not set. Before, this was not necessary if opencl was installed in a standard location like /usr.

The attached new file (OpenCL.sh - a patch doesn't make sense because it's almost a new file) implements a mechanism similar to other external libraries, but keeps the hard-coded Mac paths since they don't seem to follow any standard convention and I don't have any way to test that.

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