std::optional<T>::emplace() without a value is broken
on clang++ with gnu libstdc++. this workarounds the bug
by using the assignment operator instead.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101227
Bug: None
Change-Id: I6fd096ff4d632259e6eab776e318c1d7b15e4bd5
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/365400
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#43229}
36e5979951