[Android.mk] Update with warning flags

Android.mk

diff --git a/Android.mk b/Android.mk
index 2c26622..654f0e0 100644
--- a/Android.mk
+++ b/Android.mk
@@ -101,6 +101,7 @@
 	liblog
 LOCAL_C_INCLUDES += \
         $(LOCAL_PATH)/src
-LOCAL_CFLAGS += -DHB_NO_MT -DHAVE_OT -DHAVE_ICU -DHAVE_ICU_BUILTIN
+LOCAL_CFLAGS += -DHB_NO_MT -DHAVE_OT -DHAVE_ICU -DHAVE_ICU_BUILTIN \
+	-Wno-unused-parameter -Wno-missing-field-initializers
 LOCAL_MODULE:= libharfbuzz_ng
 include $(BUILD_SHARED_LIBRARY)