Fix the msvc failure on json config

[yhmtsai]

Sorry for another pr on this. I thought the failure from msvc cuda, which is now always failed. To avoid setting the lib path in msvc, gko makes all test works in the library path (dll location). I changed the working directory to access testing file in #1607 However, it can not find the dll path now. follow the matrices/config.hpp.in to pass the file path

[yhmtsai]

I thought the same thing, too. but I also think we can use the filesystem to replace the path when we move to c++17.

[upsj]

@yhmtsai std::filesystem is still a bit annoying to use on some slightly older compilers, see https://en.cppreference.com/w/cpp/filesystem

Notes

Using this library may require additional compiler/linker options. GNU implementation prior to 9.1 requires linking with -lstdc++fs and LLVM implementation prior to LLVM 9.0 requires linking with -lc++fs

so I think we better avoid it.

[ginkgo-bot]

Error: PR already merged!

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