Enable mold linker for non-official x64 Android builds

Bug: 40208899
Change-Id: I40db9ef2d6818131a4d8369e89498630901fedde
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7808587
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1623804}
NOKEYCHECK=True
GitOrigin-RevId: af7cc65836b65ac0565d24215097bf84d3075cf7