grep: restore usage of --include/--exclude options
The refactor in 4a73df6eb67d accidentally forgot to transform the opts
argument for walkopts into a byteskwargs. This resulted in its options
being ignored. In particular, the -X/-I pair of options was missing.
A simple fix restores its usage. Tests included, of course.
# See http://EditorConfig.org for the specification
root = true
[*.py]
indent_size = 4
indent_style = space
trim_trailing_whitespace = true
end_of_line = lf
[*.{c,h}]
indent_size = 8
indent_style = tab
trim_trailing_whitespace = true
end_of_line = lf
[*.t]
indent_size = 2
indent_style = space
trim_trailing_whitespace = false
end_of_line = lf