util-linux: expand selection of libraries and utilities

util-linux: expand selection of libraries and utilities

- Add option to control installation of libfdisk
- Add libfdisk license to the comment in util-linux.mk
- List all utilities provided by the basic set and document that
  linux32, linux64, uname26, i386 and x86_64 are symlinks to setarch
- Add options to install cal, ipcrm, ipcs, logger, lslogin and pg

Signed-off-by: Carlos Santos <casantos@datacom.ind.br>
[Thomas: add missing dependency of the new lslogins option on
libsmartcols, and therefore !MMU.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>