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:

    c-toxcore/toxcore/network.c

    Line 966 in da43876

    ip6.uint32[1] = 0;

    where uint32 is:

    c-toxcore/toxcore/network.h

    Line 200 in da43876

    uint32_t uint32[4];

---

This change is 

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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

Additional details and impacted files

@@            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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