print/qpdf: Update to 7.1.0

Additional changes:

• Added a patch to work around the missing include: https://github.com/qpdf/qpdf/pull/172
• Added a patch to fix the clang and gcc build problem: https://github.com/qpdf/qpdf/issues/177

PR: 225226
Reported by: Dmitri Goutnik <dg@syrec.org>
Approved by: tcberner (mentor)
Differential Revision: https://reviews.freebsd.org/D14119