Add libplist package

libplist is a library for manipulating Apple's Property List file
format.

Tested as working on Samsung Chromebook Plus (aarch64). All tests
passing.

packages/libplist.rb

+require 'package'
+
+class Libplist < Package
+  description 'A library to handle Apple Property List format'
+  homepage 'http://www.libimobiledevice.org/'
+  version '2.0.0'
+  source_url 'http://www.libimobiledevice.org/downloads/libplist-2.0.0.tar.bz2'
+  source_sha256 '3a7e9694c2d9a85174ba1fa92417cfabaea7f6d19631e544948dc7e17e82f602'
+
+  binary_url ({
+  })
+  binary_sha256 ({
+  })
+
+  depends_on 'glib'
+
+  def self.build
+    system './configure',
+      "--prefix=#{CREW_PREFIX}",
+      "--libdir=#{CREW_LIB_PREFIX}",
+      '--disable-dependency-tracking'
+    system 'make'
+  end
+
+  def self.install
+    system 'make', "DESTDIR=#{CREW_DEST_DIR}", 'install'
+  end
+
+  def self.check
+    system 'make', 'check'
+  end
+end