autoconf: Only define GPGPU_CODEGEN, if that feature is requested
Before we defined GPGPU_CODEGEN to '0', which does not disable the relevant code as we just check if that value is defined at all. We now follow the cmake approach and only define GPGPU_CODEGEN, if the feature should be enabled. Reported by: Sebastian Pop <spop@codeaurora.org> llvm-svn: 162275
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