Fix --no-undefined-version

[aaronmondal]

Otherwise https://reviews.llvm.org/D135402 will break builds.

[aaronmondal]

Fixes #155. I went over these symbols and they are indeed not in the opencl headers. I'm slightly unsure about clCreateImageFromD3D10Resource. This is used internally in cl_d3d10.cpp, but not part of the CL headers, neither the vendored headers in this repo nor the upstream ones in the khronos repo.