Build: Verify no external lib files were touched directly
Build: Verify no external lib files were touched directly

Those files sould be edited at their source, upstream.
Make sure that CI rejects commits with direct changes to
external library files.

Change-Id: Ie9b6a4446aa45f021acc5fd4472e53b7adc35a34

wikimedia/mediawiki-extensions-Kartographer,wikimedia/mediawiki-extensions-Kartographer,wikimedia/mediawiki-extensions-Kartographer