[New Package] rush (#5184)

packages/rush.rb

+require 'package'
+
+class Rush < Package
+  description 'GNU Rush is a Restricted User Shell.'
+  homepage 'https://www.gnu.org/software/rush/'
+  version '2.1'
+  compatibility 'all'
+  source_url 'https://ftpmirror.gnu.org/rush/rush-2.1.tar.xz'
+  source_sha256 'c2ff487d44ce3d14854d0269eb0aa4c0f98bcca35390fad5ea52da75d9e4abdf'
+
+  def self.build
+    system "./configure #{CREW_OPTIONS}"
+    system "make"
+  end
+
+  def self.install
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+  end
+  
+  def self.check
+    system "make", "check"
+  end
+end