check-code: catch 'ls filename --option' case as per
6bdae8ea0b48
minirst: improved support for option lists.
This enables minirst to parse and print option lists which have both
long and short options. Before, we could only parse option lists with
long options.
test-subrepo-git.t: portability fix.
Specifying arguments after file names for 'ls' is a GNU extension.