match: move body of _normalize() to a static function
matcher._normalize() no longer depends on any of the matcher's state,
and making it static will enable further refactoring. Note that the
subdirmatcher subclass calls _normalize(), so we can't remove it
completely.
# 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