Fix build by moving to clang.

G++ is trying to parse `if (it1->end < it2->end)` with `< it->` being
interpreted as a template parameter. Move to clang.

Bug: 18466763
Change-Id: Idf6fcdbc08963ce2b1cbe0668d25bfa39e0be38d
(cherry picked from commit cfb846e28c4d447eeb094a5578f13f7eb83333e2)
diff --git a/Android.mk b/Android.mk
index 44618fc..c566edf 100644
--- a/Android.mk
+++ b/Android.mk
@@ -21,5 +21,5 @@
 
 LOCAL_SRC_FILES := $(call private-function-all-cpp-files-under, src/lib)
 LOCAL_MODULE := libopenfst-gnustl-rtti
-
+LOCAL_CLANG := true
 include $(BUILD_STATIC_LIBRARY)