Remove no-op pragma clang lines

[brooksdavis]

Description

The two uses of #pragma clang in the tree don't do anything and cause GCC to whine about unknown pragmas in some cases so remove them.

Noticed the push when trying to build FreeBSD and it's embedded copy of libcbor with GCC 13.

I've not updated the CHANGELOG as these commits don't have any functional effect.

Checklist

• [x] I have read followed CONTRIBUTING.md
  • [ ] I have added tests
  • [ ] I have updated the documentation
  • [ ] I have updated the CHANGELOG
• [ ] Are there any breaking changes?
  • [ ] If yes: I have marked them in the CHANGELOG (example)
• [ ] Does this PR introduce any platform specific code?
• [ ] Security: Does this PR potentially affect security?
• [ ] Performance: Does this PR potentially affect performance?

[codecov[bot]]

Codecov Report

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

Project coverage is 100.00%. Comparing base (a0582ab) to head (2ba0f70).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #321 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 20 20 Lines 1658 1658 ========================================= Hits 1658 1658 ```

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