`copilot-c99`: Print constants in tests using portable suffixes. Refs #471.

[ivanperez-keera]

This commit adjusts the tests for the copilot-c99 library to use a portable way of printing constants in the C code generated by the tests, as prescribed in the solution proposed for #471.

[ivanperez-keera]

@swt2c The tests seem to pass: https://app.travis-ci.com/github/Copilot-Language/copilot/jobs/615203542#L1691-L1769

Can you please try this solution and let me know if it works?

[swt2c]

I can confirm that fef0297 does indeed fix the test compile warnings related to integer literals, thanks!

[ivanperez-keera]

Wonderful! Thank you, @swt2c!

[ivanperez-keera]

Change Manager: Changes requested:

• The commit messages talks about the show instance, but this is a CShow instance.
• It may help to add comments to the Haskell code to explain why this is done this way.
• It may help to add a comment to the commit message indicating where these macros come from.

[ivanperez-keera]

Implementor: Changes implemented. Review requested.

[ivanperez-keera]

Change Manager: Verified that:

• Solution is implemented:

  • [X] The code proposed compiles and passes all tests. Details: Build log: https://app.travis-ci.com/github/Copilot-Language/copilot/builds/267932537

  • [X] The solution proposed produces the expected result. Details: The issue cannot be easily reproduced because it is dependent on the architecture and compiler. The correct behavior has been verified by asking the user who reported the issue to confirm that they no longer experience the problem with the solution proposed. See https://github.com/Copilot-Language/copilot/pull/479#issuecomment-1862077333 for details.

• [X] Implementation is documented. Details: Internal change. No changes to the public documentation are needed. The new code is documented.
• [X] Change history is clear.
• [X] Commit messages are clear.
• [X] Changelogs are updated.
• [X] Examples are updated. Details: No updates needed.
• [X] Required version bumps are evaluated. Details: Bump not needed (internal change to tests; does not affect API).