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building FreeBSD/arm64 VM images and memstick.img installation medium: r281786, r281788, r281792: r281786: Add support for building arm64/aarch64 virtual machine images. r281788: Copy amd64/make-memstick.sh to arm64/make-memstick.sh for aarch64 memory stick images. Although arm64 does not yet have USB support, the memstick image should be bootable with certain virtualization tools, such as qemu. r281792: Add a buildenv_setup() prototype, intended to be overridden as needed. For example, the arm64/aarch64 build needs devel/aarch64-binutils, so buildenv_setup() in the release.conf for this architecture handles the installation of the port before buildworld/buildkernel. Sponsored by: The FreeBSD Foundation