There was a reproducibility issue (IRC logs) with the osx 0.19.1rc1
gitian builds. The build-id embedded into the dmg tool was mismatching.
It's possible that differing versions of binutils/ld were the cause.

While it was resolved after rebuilding the base gitian image, whether an
upstream package issue or fluke, we can remove the possibility of it
happening in future by just not embedding a build-id into the dmg tool
at all.