Install doesn't include all binaries

Hi, thanks for the work on uutils/coreutils! I'm experimenting with using them as the base for a Gentoo system, and found the make based installer doesn't include all the binaries.

In particular, with MULTICALL=y, some of the checksums (for example sha256sum) are not included.

This may relate, for some users, to #6466, since the --list can be used to create symlinks exhaustively for all the available entrypoints.