D18673: Add symlinks for flatpak

[Nathaniel Graham]

ngraham added a reviewer: VDG.

REPOSITORY
  R266 Breeze Icons

REVISION DETAIL
  https://phabricator.kde.org/D18673

To: GeeXT, #frameworks, #vdg
Cc: nibags, kde-frameworks-devel, michaelh, ngraham, bruns