Remove unused LOCAL_LDLIBS.

Change-Id: I50af9dc4b1a0fc3c937cea83555716fdc2fa00ca
diff --git a/Android.mk b/Android.mk
index 0c48290..44618fc 100644
--- a/Android.mk
+++ b/Android.mk
@@ -16,7 +16,6 @@
 LOCAL_C_INCLUDES += \
 	$(OPENFST_DIR)/src/include/
 
-LOCAL_LDLIBS += -lpthread
 LOCAL_NDK_STL_VARIANT := gnustl_static
 LOCAL_SDK_VERSION := 14