Paths with spaces not handled for Python paths

[astrelsky]

Even when the environment variables LIBDIR, GOPY_LIBDIR, LIBRARY and GOPY_PYLIB are properly set and surrounded with quotes (even tried double quoting with the inner pair escaped) spaces in the path are not properly handled. I had to move my python installation from C:\Program Files\Python3 up to C:\Python3 to get a package to build.