[PATCH] Add libreoffice symlink to libreoffice

[ng0]

The historic(?) remains of soffice (I guess it's from back when it was 
StarOffice) for libreoffice is on most systems symlinked to libreoffice.
When people install libreoffice, they expect that there'll be an exectuable 
which is very similar to the name of the application libreoffice.
This patch adds an additional symlink 'out/bin/libreoffice' to the package.