Turns out giflib 5.1.2 is the culprit and it isn't Deban-specific after all.

This should also help distributions working towards reproducible builds.

also mark images as removed/processed when clicking on them in thumbnail mode and --action is specifed

slideshow: When removing last image, stay on the last image

The following adds the ability, when using `feh` as a background setter,
to use a specific Xinerama screen to render a provided image. Along with
the provided '--bg-*' option, the '--xinerama-index' argument will be
used to identify the index of the detected Xinerama screen to use.

Signed-off-by: James Knight <james.d.knight@live.com>

The 'fehbg' variable can be allocated whether or not the user wishes to
generated a fehbg file. Ensure the variable is free'ed before we return.

Signed-off-by: James Knight <james.d.knight@live.com>