Silently fail on remote rm

Makefile

@@ -39,4 +39,4 @@ clean:
 	@rm -f ${NAME}.vert.spv
 	@rm -f ${NAME}.frag.spv
 	@rm -f trace.rd
-	@adb shell rm /data/vulkan/${NAME}/*
+	@adb shell rm -f /data/vulkan/${NAME}/*