Matt Harbison <matt_harbison@yahoo.com> [Sun, 15 Dec 2019 21:43:18 -0500] rev 43889
typing: suppress a warning that mercurial.windows.checkosfilename is missing
This function is used to check filename portability everwhere, so it isn't
tucked into the windows.py module. I supposed the alternative is to move it and
then alias it in `util`. I'm guessing it was done like this to save an import.
Differential Revision: https://phab.mercurial-scm.org/D7677