Add apriconv package

packages/apriconv.rb

+require 'package'
+
+class Apriconv < Package
+  description 'a portable implementation of the iconv() library'
+  homepage 'http://apr.apache.org/'
+  version '1.2.1'
+  source_url 'http://apache.claz.org/apr/apr-iconv-1.2.1.tar.bz2'
+  source_sha256 'c46c919bc2a36a705f91f4dea444b18a83236eef97a417528a988113b3a7e46e'
+
+  depends_on 'apr'
+  depends_on 'libtool'
+
+  def self.build
+    system './configure \
+            --prefix=/usr/local \
+            --with-apr=/usr/local'
+    system 'make'
+  end
+
+  def self.install
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+    system "libtool --mode=finish #{CREW_DEST_DIR}/usr/local/lib/iconv"
+  end
+end