When building a ignore::WalkBuilder by disabling all standard filters
and adding a custom global ignore file, the ignore file is not used. Example:
let mut walker = ignore::WalkBuilder::new(dir);
walker.standard_filters(false);
walker.add_ignore(myfile);
This makes it impossible to use the ignore crate to walk a directory
with only custom ignore files. Very similar to issue #800 (fixed in
b71a110).
PR #988
aa2ce39d14