hadrian: Suppress xelatex output unless it fails
As noted in #18835 (closed), xelatex produces an absurd amount of output, nearly all of which is meaningless. Silence this.
Fixes #18835 (closed).
As noted in #18835 (closed), xelatex produces an absurd amount of output, nearly all of which is meaningless. Silence this.
Fixes #18835 (closed).