stage2: only patch up LLD binaries on aarch64-macos
stage2: only patch up LLD binaries on aarch64-macos

The code is a bit fragile so it was causing CI failures on x86_64-macos.
Also the patch up code is only needed for aarch64-macos, so we were
doing unnecessary work.

raulgrell/zig,raulgrell/zig,zig-lang/zig,raulgrell/zig,raulgrell/zig,andrewrk/zig,zig-lang/zig,raulgrell/zig,andrewrk/zig,zig-lang/zig