py3: stringify setupversion on Windows
This was stringified a few lines above for non Windows platforms, but `version`
remains bytes. The old code effectively undid the conversion, and triggered a
warning in setuptools when building.
# See http://EditorConfig.org for the specification
root = true
[*.py]
indent_size = 4
indent_style = space
trim_trailing_whitespace = true
[*.{c,h}]
indent_size = 8
indent_style = tab
trim_trailing_whitespace = true
[*.t]
indent_size = 2
indent_style = space
trim_trailing_whitespace = false