fix: build lib into separate lib directory #12
                
     Merged
            
            
          
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For some reason, having includes in a subdirectory of the directory containing the lib breaks compilation on Windows/MSVC (as used by lux, see #11 (comment)).
Moving the libs to a separate
libsubdirectory seems to fix this.I've tested this fix by adding my fork+branch as a dependency to lux and it seems to do the trick: lumen-oss/lux#801
(the nix build failures are because of the git dependency).