Fix SO_REUSEPORT issue

[fa9r]

Describe changes

Apparently SO_REUSEPORT can also be missing under other operating systems than Windows in certain circumstances. Using an explicit hasattr check should be a more general fix than the platform check we did before.

Pre-requisites

Please ensure you have done the following:

• I have read the CONTRIBUTING.md document.
• If my change requires a change to docs, I have updated the documentation accordingly.
• If I have added an integration, I have updated the integrations table and the corresponding website section.
• I have added tests to cover my changes.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Other (add details above)