Current versions of the OpenCL headers define several version macros
and we want to make sure to parse just the main version macro.
This is a simple near-term fix, since we'd like to move to the standard
CMake FindOpenCL module and delete this custom module.
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- add #ifdefs to work around the different versions of glfw
- add cmake logic to parse other packages versions and set minimum requirements
- fix X11 dependencies for static builds of glfw
- general Find.cmake cleanup
fixes#101
