vim: don't spam warnings as errors

Change-Id: I69e33cab1ef444437d66253fe49c5eef08ccba43
diff --git a/Android.mk b/Android.mk
index aabf669..a50f513 100644
--- a/Android.mk
+++ b/Android.mk
@@ -117,6 +117,8 @@
 	-DHAVE_CONFIG_H \
 	-DSYS_VIMRC_FILE=\"/system/etc/vimrc\"
 
+LOCAL_CFLAGS += -Wno-unused-variable
+
 LOCAL_MODULE := vim
 LOCAL_MODULE_TAGS := eng
 LOCAL_MODULE_PATH := $(TARGET_OUT_OPTIONAL_EXECUTABLES)