Fix sqlsrv redundant cflags when building PHP

[crazywhalecc]

What does this PR do?

Fix sqlsrv redundant cflags when building PHP. Resolve https://github.com/static-php/static-php-cli-hosted/actions/runs/23831532972/job/69465987785#step:13:17283 .

Checklist before merging

If your PR involves the changes mentioned below and completed the action, please tick the corresponding option.
If a modification is not involved, please skip it directly.

• If you modified *.php or *.json, run them locally to ensure your changes are valid:
  • composer cs-fix
  • composer analyse
  • composer test
  • bin/spc dev:sort-config
• If it's an extension or dependency update, please ensure the following:
  • Add your test combination to src/globals/test-extensions.php.
  • If adding new or fixing bugs, add commit message containing extension test or test extensions to trigger full test suite.

[henderkes]

Is this necessary? Redundant means it builds with extra flags that aren't necessary, but we shouldn't patch the build unless it actually leads to failure.

[crazywhalecc]

Three things:

• This build error seems due to sqlsrv treating the warning as error.
• We haven't supported zstd on windows yet (v2).
• ngtcp2 on Windows needs patched version of gnutls to enable QUIC feature, we haven't supported gnutls and its deps yet.