Exclude external/github.com/rust-lang/rust external/github.com/rust-lang/rust is a mirror of upstream rust which has scanner coverage elsewhere. BUG=b:286400008 TEST=cros format security_scanning.textproto Change-Id: I9b6aa55fa16187b16c09ce92a5394b5cce0b5943 Reviewed-on: https://chromium-review.googlesource.com/c/All-Projects/+/4771180 Reviewed-by: Mike Frysinger <[email protected]>