fix: tests pass on bigendian architecture

[flavorjones]

Fixes #615 reporting failures on s390x.

[flavorjones]

@voxik Please let me know if you're able to check that this PR passes on s390x hardware, I have no way of verifying it myself.

[flavorjones]

Hmm, looks like I can run s390x on Github Actions runners using qemu emulation. Going to add a commit to this PR to add test coverage.

[flavorjones]

Ugh, the emulation layer is painfully slow, maybe because of the endianness conversion that qemu has to do? The aarch64 emulation isn't this slow.

So I'm going to validate on my local machine that this works, and will omit adding it to CI.

[flavorjones]

Looking good here:

root@4e0033608acf:/sqlite3-ruby-mount# bundle exec rake test A=-n/Pragmas/
---
:ruby: ruby 3.3.4 (2024-07-09 revision be1089c8ec) [s390x-linux-gnu]
:gem:
  :version: 2.5.0
:sqlite:
  :compiled: 3.47.2
  :loaded: 3.47.2
  :packaged: true
  :precompiled: false
  :sqlcipher: false
  :threadsafe: true
Run options: -n/Pragmas/ --seed 25872

# Running:

........

Finished in 0.066158s, 120.9221 runs/s, 332.5358 assertions/s.

8 runs, 22 assertions, 0 failures, 0 errors, 0 skips

Merging.

[voxik]

@voxik Please let me know if you're able to check that this PR passes on s390x hardware, I have no way of verifying it myself.

Yep, it solves the issue. Thanks a lot for the quick fix 🙏