Suppress unused-parameter warnings in external/libnl.

Bug: 26936282
Change-Id: I49134218cc096eb26781e3b8fa2d3b34cbca64d6
diff --git a/Android.mk b/Android.mk
index f407a83..72e0b23 100644
--- a/Android.mk
+++ b/Android.mk
@@ -28,6 +28,7 @@
 
 LOCAL_C_INCLUDES := $(LOCAL_PATH)/include
 LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)/include
+LOCAL_CFLAGS += -Wno-unused-parameter
 LOCAL_MODULE := libnl
 
 include $(BUILD_STATIC_LIBRARY)