[ruby/cgi] Exclude unused files from built package

https://github.com/ruby/cgi/commit/e840b6c368

lib/cgi/cgi.gemspec

@@ -23,10 +23,9 @@ Gem::Specification.new do |spec|
   spec.metadata["source_code_uri"] = spec.homepage
 
   spec.files         = Dir.chdir(File.expand_path('..', __FILE__)) do
-    `git ls-files -z 2>/dev/null`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
+    `git ls-files -z 2>/dev/null`.split("\x0").reject { |f| f.match(%r{\A(?:(?:test|spec|features)/|\.git)}) }
   end
   spec.extensions    = ["ext/cgi/escape/extconf.rb"]
-  spec.bindir        = "exe"
   spec.executables   = []
   spec.require_paths = ["lib"]
 end