Run source_is_in_build_files on build file changes
Run source_is_in_build_files on build file changes

Trigger the source_is_in_build_files presubmit check if BUILD, .bzl,
.gn, or .gni change.

Change-Id: Ic6d5f1a61b9691a87511d994534ff4a19aeb0c9e

google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed