Updated README.org: no more need for -lOpenCL.
Updated README.org: no more need for -lOpenCL.

Since -lOpenCL is added to extra-libraries: and Framework:
sections of *.cabal file, it is no longer necessary to provide
them explicitly for GHCi, and GHC --make.

IFCA/opencl,Delan90/opencl,IFCA/opencl,Delan90/opencl