[CMake] cmakedefine based on find_package

[Aaron Boxer]

Hello,

I am using find_package to find the OpenCL install on my system.
Finding the package sets OPENCL_FOUND to true.
I would like to create a #define in the code that will match this cmake
variable,
so I have set

#cmakedefine HAVE_OPENCL @OPENCL_FOUND@

in my config.h.cmake.in file.

However, I get

/* #undef HAVE_OPENCL */

in the corresponding include file.

Thanks,
Aaron
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