Add ragel to third_party.

deps/third_party/ragel/build.sh

+#!/bin/bash
+# Copyright (c) 2012 The Native Client Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+set -x
+set -e
+set -u
+
+declare -r RAGEL_VERSION=6.7
+
+if [[ "$(uname -s)" = "Darwin" ]] ; then
+  PLATFORM=mac
+else
+  case "$(uname -o)" in
+    *cygwin* )
+      PLATFORM=cygwin ;;
+    *Linux* )
+      PLATFORM=linux ;;
+  esac
+fi
+
+cd "$(dirname "$0")"
+rm -rf ragel-${RAGEL_VERSION}
+tar xSvpf ragel-${RAGEL_VERSION}.tar.gz
+(
+  cd ragel-${RAGEL_VERSION}
+  for patch in ../??-ragel-${RAGEL_VERSION}.*.patch ; do
+    patch -p0 < $patch
+  done
+  ./configure
+  make -j16 \
+    CXXFLAGS="-m32 -O3" \
+    CXXLD='gcc -s' \
+    LIBS='-Wl,-Bstatic -lstdc++ -Wl,-Bdynamic'
+  cp -fv ragel/ragel ../ragel.${PLATFORM}
+)
+rm -rf ragel-6.7