Add pdfcrack package

pdfcrack is a tool for recovering passwords for PDF files.

Tested as working on Samsung Chromebook Plus (aarch64).

packages/pdfcrack.rb

+require 'package'
+
+class Pdfcrack < Package
+  description 'pdfcrack is a command line, password recovery tool for PDF-files.'
+  homepage 'https://sourceforge.net/projects/pdfcrack'
+  version '0.16'
+  source_url 'https://sourceforge.net/projects/pdfcrack/files/pdfcrack/pdfcrack-0.16/pdfcrack-0.16.tar.gz'
+  source_sha256 '7865b203074ccfd5c612c8ce00c46ffcb4fabaa26154ce9304dfc668c7cb73ef'
+
+  binary_url ({
+  })
+  binary_sha256 ({
+  })
+
+  def self.build
+    system 'make'
+  end
+
+  def self.install
+    system "install -Dm755 pdfcrack #{CREW_DEST_PREFIX}/bin/pdfcrack"
+  end
+end