Add patch upstream status for gn-0153d369-no-O3.patch

gn.spec

@@ -47,7 +47,8 @@ Source0:        %{url}/+archive/%{commit}.tar.gz#/gn-%{shortcommit}.tar.gz
 Source1:        last_commit_position.h
 Source2:        update-version
 
-# Stop overriding optimization flags
+# Stop overriding optimization flags; not sent upstream because this is
+# intentional on their part
 Patch:          gn-0153d369-no-O3.patch
 
 BuildRequires:  python3-devel