In commit 7d2cc6ece6 (presets: Allow comments in presets files,
2024-06-23) we added a member without an initializer. This causes
dynamic analysis to report use of an uninitialized value.
`include-what-you-use` diagnostics, in practice, are specific to
the environment's compiler and standard library. Update includes
to satisfy IWYU for our CI job under Debian 12.
