chore: Fix Circle CI build failing

[nurupo]

Circle CI's image got updated to use Ubuntu 24.04 (Noble Numbat), which:

• Changed a bit how clang is packaged -- libclang_rt.ubsan_standalone-x86_64.a is no longer getting installed

• Includes a newer clang with more enabled warnings in one the umbrella flags like -Weverything, -Wall, etc., like -Wswitch-default and -Wunsafe-buffer-usage:

  • We actually do not want a default in our switches, we want to explicitly handle every case and get warned when we don't, so -Wswitch-default should be disables
  • -Wunsafe-buffer-usage seems to be broken, it warns on things that are perfectly ok, like doing foo[1] = 0; where uint32_t foo[4];, e.g.

  warning:

  /root/work/toxcore/network.c:966:9: error: unsafe buffer access [-Werror,-Wunsafe-buffer-usage]
    966 |         ip6.uint32[1] = 0;
        |         ^~~~~~~~~~

  on:

  https://github.com/TokTok/c-toxcore/blob/da438763d5b8e071de6e061a1dcaddd2177dff7d/toxcore/network.c#L966

  where uint32 is:

  https://github.com/TokTok/c-toxcore/blob/da438763d5b8e071de6e061a1dcaddd2177dff7d/toxcore/network.h#L200

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This change is 

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 73.08%. Comparing base (5344d7f) to head (102a1fa).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2755 +/- ## ========================================== - Coverage 73.09% 73.08% -0.02% ========================================== Files 149 149 Lines 30531 30531 ========================================== - Hits 22317 22313 -4 - Misses 8214 8218 +4 ```

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