test-obsolete: update extension in test to actually work
This hasn't been testing anything since partway through the 3.7 cycle
due to unrelated refactoring. Sadly, the behavior it was trying to
prevent reemerged in the codebase at that time. A fix is in the next
patch, because proving that the fix was actually correct ended up
being trickier than I expected.
# 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