couchbase-lite-C unable to build library on windows

This sort of half Linux half Windows environment is not and never will be a supported environment to build in. The way to build it on Windows is similar to the LiteCore instructions. Basically, use CMake to create a visual studio solution and then build the visual studio solution. Visual Studio 2017+ is required. The last time I checked it was building ok, but this is not a project that is worked on full time.