This is a little helper that Graham cobbled together at one point, it
will filter an exact list of files.
Change-Id: Iab786abcd4a7a3cce45a20b2950f103defa91998
Reviewed-on: https://cl.tvl.fyi/c/depot/+/5332
Reviewed-by: Profpatsch <mail@profpatsch.de>
Tested-by: BuildkiteCI
