Fix MacOS ARM platform configuration

[tautschnig]

Apple decided to deviate from aarch64 configurations used by other
Unix-like operating systems as documented at
https://developer.apple.com/documentation/xcode/writing_arm64_code_for_apple_platforms#//apple_ref/doc/uid/TP40013702-SW1.

Fixes: #5627

• Each commit message has a non-empty body, explaining why the change was made.
• n/a Methods or procedures I have added are documented, following the guidelines provided in CODING_STANDARD.md.
• n/a The feature or user visible behaviour I have added or modified has been documented in the User Guide in doc/cprover-manual/
• Regression or unit tests are included, or existing tests cover the modified code (in this case I have detailed which ones those are in the commit message).
• n/a My commit message includes data points confirming performance improvements (if claimed).
• My PR is restricted to a single feature or bugfix.
• n/a White-space or formatting changes outside the feature-related changed lines are in commits of their own.

[codecov]

Codecov Report

Merging #5628 (4435150) into develop (4d14272) will decrease coverage by 37.08%.
The diff coverage is 33.33%.

@@             Coverage Diff              @@
##           develop    #5628       +/-   ##
============================================
- Coverage    69.36%   32.27%   -37.09%     
============================================
  Files         1241      983      -258     
  Lines       100561    83533    -17028     
============================================
- Hits         69752    26962    -42790     
- Misses       30809    56571    +25762     

Flag	Coverage Δ
cproversmt2	?
regression	?
unit	32.27% <33.33%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/util/config.cpp	29.36% <33.33%> (-28.28%)	⬇️
src/cpp/cpp_id.h	0.00% <0.00%> (-100.00%)	⬇️
src/cpp/cpp_scope.h	0.00% <0.00%> (-100.00%)	⬇️
src/cpp/cpp_token.h	0.00% <0.00%> (-100.00%)	⬇️
src/cpp/cpp_name.cpp	0.00% <0.00%> (-100.00%)	⬇️
src/cpp/cpp_util.cpp	0.00% <0.00%> (-100.00%)	⬇️
src/util/identifier.h	0.00% <0.00%> (-100.00%)	⬇️
src/xmllang/graphml.h	0.00% <0.00%> (-100.00%)	⬇️
src/cpp/cpp_is_pod.cpp	0.00% <0.00%> (-100.00%)	⬇️
src/cpp/template_map.h	0.00% <0.00%> (-100.00%)	⬇️
... and 945 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 4d14272...4435150. Read the comment docs.