Hopefully fixes sandboxed build of glibc on aarch64, as discussed on 8bfa9f528c. Picked from the following cross-trunk evaluation: http://hydra.nixos.org/eval/1341395 based on nixpkgs commit bb3ef8a95c. build job: http://hydra.nixos.org/build/50125932 (busybox's hash not changing is not a bug!)
8bfa9f528c
bb3ef8a95c
Picked from the following cross-trunk evaluation: http://hydra.nixos.org/eval/1326772#tabs-still-succeed based on nixpkgs commit 264d42b9cf. dist job: http://hydra.nixos.org/build/47094514
264d42b9cf
These are temporary and will be switched to Hydra-build ones once all the aarch4 changs are merged.