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