textproc/pdfgrep: Update to 2.0.1

While here:

• Update LICENSE and WWW
• Add new dependencies
• Remove tweaks for building

Changes: https://pdfgrep.org/news/pdfgrep-2.0.1-released.html

PR: 220854
Submitted by: amistry@am-productions.biz
Approved by: michael@ranner.eu (maintainer)