The change landed in https://commits.webkit.org/r287137 has issues that need addressing. ANGLE doesn't need to create symlinks as it goes WebCore.frameworks. The create symlink script for WebCore, WebGPU & WebInspectorUI had the output in outputFileListPaths instead of outputPaths.
<rdar://86590599>
Created attachment 447730 [details] Patch
Note that there are important steps to take when updating ANGLE. See https://trac.webkit.org/wiki/UpdatingANGLE
Committed r287326 (245476@trunk): <https://commits.webkit.org/245476@trunk>