dns/dnsmasq-devel: update to v2.91test2 plus warning fixes

I am also adding a set of fixes I've also sent upstream,
to make this compile without GNU extensions under -pedantic-errors.

Upstream Git history since test1, author Simon Kelley unless stated
otherwise.

* 0f437b3 2024-12-20 | Banish compiler warnings. (tag: v2.91test2, origin/master, origin/HEAD)
* 8a5fe8c 2024-12-20 | Extend the code to effciently close unwanted file descriptors to *BSD.
* 2a664c0 2024-12-20 | bpf.c: Follow callback updates. [Matthias Andree]
* 4902807 2024-12-20 | Fix [-Wgnu-variable-sized-type-not-at-end] warning.
* 742af6e 2024-12-20 | Refactor receive_query() to removed duplicated code.
* 3eb008c 2024-12-19 | Further refactoring of the TCP DNS codepath.
* 32248eb 2024-12-19 | Fix thinko in 3b74df4f55b1107b051183d6b628eb02933cb00a