Linux: silence gnu-variable-sized-type-not-at-end warnings

Test: compile on linux using ninja
Change-Id: If3fed35017e4aa8cfc2740b49eb4ff547b4e7e5f
diff --git a/build/BUILD.gn b/build/BUILD.gn
index af7d5d8..8a36d74 100644
--- a/build/BUILD.gn
+++ b/build/BUILD.gn
@@ -28,6 +28,7 @@
     #TODO(jpawlowski): uncomment once we have no warnings on linux build
     #    "-Wall",
     #    "-Werror",
+    "-Wno-gnu-variable-sized-type-not-at-end",
     "-g",
     "-O0",
     "-fpic",