HPCC-26086 Fix Coverity scan issues in httplib

[timothyklemm]

Fix four conditionally compiled calls to setsockopt that generated CHECKED_RETURN errors in unconditional code.

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Testing:

[github-actions]

https://track.hpccsystems.com/browse/HPCC-26086
Jira updated

[timothyklemm]

@asselitx all this is doing is making the intent to ignore return values explicit to silence the Coverity scan.

[timothyklemm]

@ghalliday please merge

[github-actions]

Jirabot Action Result:
Added fix version: 9.10.0
Workflow Transition: 'Resolve issue'