Openh264 switched from api/svc to api/wels as the location for some codec header files. During the transition it was necessary to conditionally from either the old or new location, but now that the switch is completed and has settled for about two weeks the conditionals can be removed. This finishes the #include transition started by webrtc-review.googlesource.com/c/280800 Bug: chromium:1218384 Change-Id: Ic0847428d134687908cc26fec1fdec0c612674b2 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/281561 Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Sergey Silkin <ssilkin@webrtc.org> Auto-Submit: Bruce Dawson <brucedawson@chromium.org> Commit-Queue: Sergey Silkin <ssilkin@webrtc.org> Cr-Commit-Position: refs/heads/main@{#38622}