I have a global pipeline library configured for use my pipeline jobs. In a pipeline I have GitHub hook trigger for GITScm polling enabled. In the pipeline itself I use git scm to checkout a repo. 

Push changes to either global pipeline (bad) or the project I checkout with git scm (good) trigger a new build.

In summary: pushing changes to pipeline libs should not trigger new builds for all my jobs that use GITscm polling.