Intel compiler fixes and CI

Build fails with

```
/home/ruben/workspace/boost-root/libs/mysql/include/boost/mysql/impl/internal/protocol/deserialize_text_field.ipp:95:35: error: explicit comparison with infinity in fast floating point mode [-Werror,-Wtautological-constant-compare]
if (!ok || std::isnan(val) || std::isinf(val)) // SQL std forbids these values
```

When building with the newest icpx.

Start by reproducing the failure with the newest icpx and inspect libs/mysql/include/boost/mysql/impl/internal/protocol/deserialize_text_field.ipp around line 95. Trace the existing CI compiler configuration mentioned in the title. Done means the MySQL library builds with icpx without this warning being treated as an error and CI covers the compiler case.

Written by the indexing model from the issue text.