[build][LSC] Prepare for -Werror everywhere

Change-Id: Idfdf4208f03534baa1ad23715b7e739ee4997d26
diff --git a/BUILD.gn b/BUILD.gn
index 18e48e9..b7e7a40 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -47,6 +47,7 @@
     "-Wno-tautological-pointer-compare",
     "-Wno-unused-function",
     "-Wno-enum-compare",
+    "-Wno-misleading-indentation",
   ]
   defines = [
     "HAVE_CONFIG_H",