Disable another warning in the libc++ tests.
am: 262ab18c26

Change-Id: I85ecd24e10138511c7a117b4d00c4eb3bdc8b9fc
diff --git a/buildcmds/Android.mk b/buildcmds/Android.mk
index 70f1701..03d719e 100644
--- a/buildcmds/Android.mk
+++ b/buildcmds/Android.mk
@@ -29,8 +29,8 @@
     -fsized-deallocation \
     -fexceptions \
     -UNDEBUG \
-    -w \
     -Wno-error=non-virtual-dtor \
+    -Wno-format-zero-length \
     -Wno-reserved-user-defined-literal \
     -Wno-unused-local-typedef \
     -Wno-unused-variable \