Allow a library file to be aggregated

Created a MR with a fix, which works for me with D10.3 && advagg 6.0.0-alpha1

I've added this in the past because of problems with advagg, depending on the configuration (I believe, it appeared when using the JS minification sub-module and maybe depending on how that is configured).

But as this is anyway a workaround on behalf of another module (advagg), which became unusable with Drupal 10.1+, I think it's a good idea to merge your MR. Hopefully, advagg will solve that, if there we'll see a working version again sometime :)

Automatically closed - issue fixed for 2 weeks with no activity.