remove external/opencl/

old-commit-hash: 95e1dec8b8

external/opencl/intel-opencl-devel_0r3.1-58621_amd64.deb

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external/opencl/intel.icd

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external/opencl/opencl-1.2-base-pset_6.4.0.37-2_all.deb

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external/opencl/opencl-1.2-base_6.4.0.37-2_amd64.deb

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external/opencl/opencl-1.2-intel-cpu_6.4.0.37-2_amd64.deb

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