Add gnustl+rtti version of library

Previously, code linked against gnustl could not
use this library, due to conflicts with stlport used
here. I've added gnustl version, called libregex-re2-gnustl-rtti

Bug: 7484202
Change-Id: I951a8d85bb46eefb6da523806632107064b7f12c
Updaiting re2 to the re2-20130115.

Updating RE2 to latest from:
   https://re2.googlecode.com/files/re2-20130115.tgz

Change-Id: I0b2527af4443bf8815db2c78ef14f6edfe3ecb37
Merge tag 'android-4.3_r2.1' into jellybean-mr2.1

Android 4.3 release 2.1