Correct the package's makefile name.
Remove previous OS-dependent hack whereby we had no info files on NetBSD.
Regenerate indent.info to include DIR specifications, and install using
install-info.
Use uname -s to work out the Operating System.
FreeBSD has install-info and /usr/share/info/dir by default.
NetBSD doesn't, so, for now, don't try to do this on NetBSD.