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
2 files changed