Handle the case in which neither WEBRTC_ARCH_X86_FAMILY nor WEBRTC_HAS_NEON are defined. Bug: webrtc:10480 Change-Id: I241583911d8e5645dfbd39b60337dd20b2d9f046 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/196525 Commit-Queue: Alessio Bazzica <alessiob@webrtc.org> Commit-Queue: Sam Zackrisson <saza@webrtc.org> Reviewed-by: Sam Zackrisson <saza@webrtc.org> Cr-Commit-Position: refs/heads/master@{#32786}