buildroot

libvips: new package

[Thomas:
 - Fix variable name: LIBVIPS_CONF_OPTSS -> LIBVIPS_CONF_OPTS
 - Add a lot of --without-<foo> options to make sure we explicitly
   disable optional features that are not handled by the .mk file.
 - Remove the host-swig dependency, which was probably thought of
   being needed by Pieter due to --without-python not being passed
   explicitly.
 - Remove trailing spaces in Config.in.
 - Rename patch to the new naming convention.]

Signed-off-by: Pieter De Gendt <pieter.degendt@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>