while checking for software supported codecs avoid creating encoder factory to avoid linking av1 encoder and libaom. Bug: webrtc:11404 Change-Id: I32771696efb59d98ba08592a20eb691b56622deb Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/172625 Reviewed-by: Sami Kalliomäki <sakal@webrtc.org> Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org> Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/master@{#30973}