Revert "symlink_outputs: Add .KATI_SYMLINK_OUTPUTS to build/make..."

Revert submission 1433935-symlink_outputs

Reason for revert: symlink_outputs was added so bazel could run ninja files, but we abanoned that approach in roboleaf, and then roboleaf was cancelled entirely. Remove this feature so we're more compatible with upstream ninja / n2.

Reverted changes: /q/submissionid:1433935-symlink_outputs

Change-Id: I5a779695689148ed32037f7f82887c458a3587cd