[CI] Use non gold linker for the AUR packages

Summary: The gold linker is no longer part of the default base development package.

Test Plan: The v0.28.12 AUR package was uploaded with this config.

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Differential Revision: https://reviews.bitcoinabc.org/D15758