Fixing build test on windows

[henryiii]

This adds a config setting for the build and test. Let's see if this works (not testing on Windows locally).

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[henryiii]

I'll try to fix this tomorrow. I'll have to start up a Windows instance to run it and figure out how to get the configuration into the build-and-run part. CMake does this in its tests, but there are too many levels of variables for me to see where the config selection part is.

[henryiii]

@ddemidov, I've almost got this working. One problem left in vexcl/types.hpp:

// This should be available for all backends
...
#include <CL/cl_platform.h>

This is not true on Windows if you are using the JIT platform, since the OpenCL headers are not in the path by default.

[ddemidov]

Well, the comment means "It should be made available". What I did on platforms where it was not, is download a copy of cl_platform.h from Khronos OpenCL Registry and copy it to vexcl/CL together with cl.hpp. Unfortunately, this does not always work, so it can not be done permanently: a54182f36193bd4442cd5d2f30d534d127ca26c5

[henryiii]

Done, Appveyor fixed. (Along with the previous mac fix). CMake should give a warning if OpenCL headers are not found for the JIT target, and captures the OpenCL header location for JIT target.

[ddemidov]

Thanks, this looks great!