Provide multicall-binary as a separated package

Description:

GNU coreutils supports building as multicall binary with --enable-single-binary=symlinks flag. If multi-call coreutils binary is given by coreutils-multicall package, and symlinks are given by coreutils package, we can install drop-in package without removing GNU coreutils completely (see coreutils-uutils or coreutils-uutils-symlink in AUR).

Moreover, we can create drop-in AUR package by mixing symlinks of coreutils and uu-coreutils.

The multicall build also reduce package size few MB.

• package version:9.6-4