HPCC-35543 Enable strict warnings in jhtree

[ghalliday]

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[github-actions]

Jira Issue: https://hpccsystems.atlassian.net//browse/HPCC-35543

Jirabot Action Result:
Assigning user: gavin.halliday@lexisnexisrisk.com
Workflow Transition To: Merge Pending
Updated PR

[mckellyln]

perhaps technically cast to (size32_t) but it's the same ...

[ghalliday]

True, but the argument to the function should also be size32_t. I will merge as-is, but could be further cleaned up.

[mckellyln]

Approved.

[github-actions]

Jirabot Action Result:
Added fix version: 10.0.22
Workflow Transition: 'Resolve issue'