[Libreoffice] sd resource images

[David Tardon]

Hi all,

I've noticed that a slight irregularity in the way resource images for
sd are stored. The bulk of them is in default_images/sd/res, but there
are a few in default_images/sd/res/imagelst which is unlike all other
modules. Therefore, gbuildizing sd requires adding another path to
gb_ResTarget in solenv/gbuild/AllLangResTarget.mk which would not be
necessary if the images could just be moved one dir up. Is there any
reason for existence of the subdir (other than "historical")? 

D.