dev-ruby/pdf-reader: remove unused patch.

dev-ruby/pdf-reader/files/pdf-reader-1.3.3-Rakefile.patch

@@ -1,33 +0,0 @@
---- Rakefile.old	2014-05-07 00:17:16.985166191 +0200
-+++ Rakefile	2014-05-07 00:17:46.592166984 +0200
-@@ -5,28 +5,8 @@
- require 'rdoc/task'
- require 'rspec/core/rake_task'
- 
--# Cane requires ripper, which appears to only work on MRI 1.9
--if RUBY_VERSION >= "1.9" && RUBY_ENGINE == "ruby"
--
--  desc "Default Task"
--  task :default => [ :quality, :spec ]
--
--  require 'cane/rake_task'
--  require 'morecane'
--
--  desc "Run cane to check quality metrics"
--  Cane::RakeTask.new(:quality) do |cane|
--    cane.abc_max = 20
--    cane.style_measure = 100
--    cane.max_violations = 93
--
--    cane.use Morecane::EncodingCheck, :encoding_glob => "{app,lib,spec}/**/*.rb"
--  end
--
--else
--  desc "Default Task"
--  task :default => [ :spec ]
--end
-+desc "Default Task"
-+task :default => [ :spec ]
- 
- desc "Run all rspec files"
- RSpec::Core::RakeTask.new("spec") do |t|