Ignore unused parameter warnings

Change-Id: Ifda4018e66336e290444417ead080a0f541a1ffb
diff --git a/Android.mk b/Android.mk
index bbbc57a..74128df 100644
--- a/Android.mk
+++ b/Android.mk
@@ -2,7 +2,7 @@
 include $(CLEAR_VARS)
 LOCAL_MODULE := libjson
 LOCAL_PATH := $(LIBJSON_ROOT)
-LOCAL_CFLAGS := -Werror -Wno-error=unused-parameter
+LOCAL_CFLAGS := -Werror -Wno-unused-parameter
 LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)
 LOCAL_SRC_FILES := arraylist.c \
 		debug.c \