std::optional<T>::emplace() without an initializer is broken on clang++
with gnu libstdc++. this workarounds the bug by removing the
absl::optional wrapping, which is actually pointless.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101227
Bug: chromium:41455655
Change-Id: I05354e57cc4cdda3fa6d3cd23f46462b69cc3bee
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/355900
Commit-Queue: Per Kjellander <perkj@webrtc.org>
Reviewed-by: Per Kjellander <perkj@webrtc.org>
Reviewed-by: Diep Bui <diepbp@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#42561}
4157f3def0