Add ragel to third_party.

deps/third_party/ragel/README.nacl

Index: deps/third_party/ragel/README.nacl
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+Name: ragel
+URL: http://www.complang.org/ragel/
+Version: 6.7
+Date: 2011-05-22
+License: GPL
+
+Description: Ragel is State Machine Compiler
+
+Ragel compiles executable finite state machines from regular languages. Ragel
+targets C, C++, Objective-C, D, Java and Ruby. Ragel state machines can not only
+recognize byte sequences as regular expression machines do, but can also execute
+code at arbitrary points in the recognition of a regular language.
+
+Code embedding is done using inline operators that do not disrupt the regular
+language syntax.
+
+This is a 32bit version prebuilt on Ubuntu Lucid.
+
+Build script (build.sh) is included.
+
+Local changes:
+  -GT2 patch is cherry-picked from upstream ragel-6-gt2 branch