Add libtinfo package

Change source_url from https to http

packages/libtinfo.rb

+require 'package'
+
+class Libtinfo < Package
+  description 'Missing ncurses library reference.'
+  homepage 'https://www.gnu.org/software/ncurses/'
+  version '0.22'
+  source_url 'http://downloads.sourceforge.net/project/karthas/release/0.22/libtinfo.so.5'
+  source_sha256 'e503d6c9fd549bbcac64645d3e4491401f906bd7f10d36bc32390e058066a520'
+
+  binary_url ({
+  })
+  binary_sha256 ({
+  })
+
+  depends_on 'ncurses'
+
+  def self.install
+    # See https://forums.opensuse.org/showthread.php/446927-missing-library-libtinfo-so-5.
+    # See also http://www.linuxforums.org/forum/installation/6251-libtinfo-so-5-a.html.
+    system "mkdir -p #{CREW_DEST_LIB_PREFIX}"
+    system "ln -sf #{CREW_LIB_PREFIX}/libncurses.so.6 #{CREW_DEST_LIB_PREFIX}/libtinfo.so.5"
+  end
+end