Add qrencode package (#3854)

Libqrencode is a fast and compact library for encoding data in a QR Code
symbol.

Tested on ARM.

packages/qrencode.rb

+require 'package'
+
+class Qrencode < Package
+  description 'Libqrencode is a fast and compact library for encoding data in a QR Code symbol'
+  homepage 'https://fukuchi.org/works/qrencode/'
+  version '4.0.2'
+  source_url 'https://fukuchi.org/works/qrencode/qrencode-4.0.2.tar.gz'
+  source_sha256 'dbabe79c07614625d1f74d8c0ae2ee5358c4e27eab8fd8fe31f9365f821a3b1d'
+
+  binary_url ({
+  })
+  binary_sha256 ({
+  })
+
+
+  depends_on 'libpng'
+
+  def self.build
+    system './configure',
+           "--prefix=#{CREW_PREFIX}",
+           "--libdir=#{CREW_LIB_PREFIX}"
+    system 'make'
+  end
+
+  def self.install
+    system 'make', "DESTDIR=#{CREW_DEST_DIR}", 'install'
+  end
+end