[hdEmbree] ensure we respect PXR_WORK_THREAD_LIMIT (standalone) #3370
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Important
This is a duplicate of this PR:
...except pulled out of the UsdLux-HdEmbree PR "chain", to make for easier standalone integration, as it has no other PR dependencies, and is a simple/small change.
I will close this PR if the other is merged first, and vice-versa.
Description of Change(s)
Fixes an issue where pre-oneTBB, threads spawned from the non-root thread (such as the render thread) would not respect PXR_WORK_THREAD_LIMIT
Fixes Issue(s)