Add tcl (8.6.6) package

Tcl (Tool Command Language) is a very powerful but easy to learn dynamic
programming language, suitable for a very wide range of uses, including
web and desktop applications, networking, administration, testing and
many more.

Tested as working properly on Samsung XE50013-K01US.

packages/tcl.rb

+require 'package'
+
+class Tcl < Package
+  version '8.6.6' 
+  source_url 'http://downloads.sourceforge.net/tcl/tcl8.6.6-src.tar.gz'
+  source_sha1 '169dd1589cad62c9fac4257c113db245da502cd0'
+
+  def self.build
+    FileUtils.chdir("unix") do
+      if `uname -m`.strip == "x86_64"
+        system "./configure --prefix=/usr/local --enable-64bit"
+      else
+	system "./configure --prefix=/usr/local"
+      end
+      system "make"
+    end
+  end
+
+  def self.install
+    FileUtils.chdir("unix") do
+      system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+      system "make", "DESTDIR=#{CREW_DEST_DIR}", "install-private-headers"
+    end
+  end
+end