Tony Herre 93788b68c6 Make platform_thread.cc build under emscripten without pthread support
Otherwise targets which don't need threads but transitively include this
fail to build due to missing thread priority symbols as described in the
bug.

Bug: webrtc:349961287
Change-Id: I33098a150387b8d20ab9344f49d7c7cb19be2db4
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/355901
Auto-Submit: Tony Herre <herre@google.com>
Reviewed-by: Tomas Gunnarsson <tommi@webrtc.org>
Commit-Queue: Tomas Gunnarsson <tommi@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#42563}
2024-06-29 16:12:11 +00:00
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