Add some "function global" prefixing in line with what we do in other places now, and drop the "manual filename" prefixing that is no longer necessary since https://github.com/GNOME/libglnx/commit/23f7df15006f14ddc3bc2ddee690f7f8604c3ebe Closes: https://github.com/ostreedev/ostree/issues/1467 Closes: #1485 Approved by: jlebon