Added warning suppression for -Wtautological-unsigned-enum-zero-compare

Change-Id: If48fa33831aa6ea196e40bda6876abff8d669a2f
diff --git a/BUILD.gn b/BUILD.gn
index 66f6f47..5dbdcb4 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -13,6 +13,7 @@
     "-Wall",
     "-Wextra",
     "-Wno-missing-field-initializers",
+    "-Wno-tautological-unsigned-enum-zero-compare",
     "-Wno-tautological-unsigned-zero-compare",
     "-Wno-unused-parameter",
   ]