There's a merged pull request on the void-packages repository

sane: fix PDF-producing eSCL scanners failing with `Invalid argument`
https://github.com/void-linux/void-packages/pull/42569

Description:
eSCL-speaking scanners that produce PDF-formatted output scan properly, but completion is only met with `sane_start: Invalid argument` expressed in various forms depending on front-end.

This is due to SANE being built without PDF support, provided by poppler-glib; this commit enables that as a default-on option, fixing support for those scanners.

#### Testing the changes
- I tested the changes in this PR: **YES** (using an EPSON XP-325)