On my machine ZLUDA seems to segfault when initializing LLVM's C++ statics in Blender. Blender ships with C++ runtime. It seems that compiling C++ runtime statically fixes the issue. Might be actually unrelated.
Additionally, dtor crate on Windows seem to use a slightly dodgy method, so replace it with something more straightforward
Fixes issues pointed out in #27:
* spirv_tools-sys was build in non-test profiles
* By default ZLUDA dll has a wrong name
* We relied on third-party OpenCL installation on Windows
* We encouraged building debug configuration
* We didn't provide build information for developers (cmake, python, submodules)