Switch to gnustl with rtti

Required for compiling with greco3 code.
Added -gnustl-rtti suffix to distinguish from stlport libs
Reverted changes added for stlport.

Bug: 7484202
Change-Id: Ib69db7117821f97133cadaae0f45b4e8ed2fda01
diff --git a/README.android b/README.android
index 1e90058..14f41f7 100644
--- a/README.android
+++ b/README.android
@@ -1,3 +1,3 @@
 Copy of openfst-1.3.2-CL32004048 from Greco3.
 
-Modified to use stlport, Android.mk file added.
+Android.mk file added.