print/cups-filters: update 1.11.4 -> 1.13.4

• Add LICENSE
• Add dependency to mupdf
• Update distinfo
• Update pkg-plist
• Add patches to filter/gstoraster.c and filter/mupdftoraster.c due to execvpe() not existing under FreeBSD

PR: 217848
Submitted by: Naram Qashat <cyberbotx@cyberbotx.com> (maintainer)