Log Message:
qpdf: Update to 11.4.0

Changelog:
This is qpdf version 11.4.0. This release contains a few minor
enhancements and bug fixes. Highlights include improving annotation
flattenening to avoid losing annotations in certain technically
incorrect but otherwise usable PDF files, and an enhancement to
--optimize-images that allows it to traverse into form XObjects.
This release also corrects a packaging error that was causing the
MinGW DLL to be about 12 times larger than necessary.