build: Use character literals for generated headers to avoid narrowing #31547

1. 
   l0rinc commented at 1:39 pm on December 20, 2024: contributor

   Use character literals instead of integer hex values (i.e. '\x5b','\x0a', ... instead of 0x5b, 0x0a, ...) for generated JSON headers for tests. This avoids C++11 narrowing warnings in a more concise way than using explicit char casts.

   Extra whitespace is also removed between elements for brevity.

   Split out of #31542 (review)

2. build: Use character literals for generated headers to avoid narrowing

   Use character literals instead of integer hex values (i.e. `'\x5b','\x0a', ...` instead of `0x5b, 0x0a, ...`) for generated headers.
   This avoids C++11 narrowing warnings in a more concise way than using explicit char casts.
   
   Extra whitespace is also removed between elements for brevity.

   63b6b638aa
3. 
   DrahtBot commented at 1:39 pm on December 20, 2024: contributor

   The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

   Code Coverage & Benchmarks

   For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/31547.

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   Conflicts

   Reviewers, this pull request conflicts with the following ones:

   • #31176 (ci: Test cross-built Windows executables on Windows natively by hebasto)

   If you consider this pull request important, please also help to review the conflicting pull requests. Ideally, start with the one that should be merged first.

4. DrahtBot added the label Build system on Dec 20, 2024

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