Run pcid on aarch64

See merge request !358

Set max-page-size for linking bootstrap

See merge request !357

Without this the virtual addresses will not match the file offsets for
the final initfs blob on AArch64 as there it will align to 64k by
default.

Improve the package policies

See merge request !356

Pass bootstrap code to redox-initfs-ar for inclusion in the initfs

See merge request !355

Set RUST_BACKTRACE=1 in init.rc

See merge request !353

This helps with debugging panics.

Update ZSTD recipe status and add simple build script

See merge request redox-os/cookbook!352