This would allow use of better icon names ( fdo#30425 ) and
minimizes space size needed by reuses of same icons bitmaps
with different filenames.

Icon packages shoud have a file named "links.txt" on root folder
in order to achieve that. It binds a name of a 'virtual' file to
an existing one, to avoid duplicates.

This file should contain one or more lines like this:
path/for/fakefile_that_reuse_a_bitmap.png path/for/existing_one.png

Implemented as discussed in:
http://lists.freedesktop.org/archives/libreoffice/2013-April/049650.html

Change-Id: Ia65a1ba18f93297fae47fa520104821f6f336694
Signed-off-by: Rodolfo Ribeiro Gomes <rodolforg@gmail.com>
Reviewed-on: https://gerrit.libreoffice.org/3953Reviewed-by: Fridrich Strba <fridrich@documentfoundation.org>
Tested-by: Fridrich Strba <fridrich@documentfoundation.org>