package/tiff: Rework tiff utilities handling

Remove all utility-specific options in favour of a generic
option which select either all or no packages. If users
want something more fine-grained than that, they can always
remove the unnecessary tools in a post-build script.

Since tiff has no configure option or Makefile target to prevent
the build/install of its utilities specific Makefile targets are
called to build the libtiff and, optionally, the utilities.

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
[Arnout: more compact implementation, slightly extend help text]
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>