* Merge from Debian unstable. Remaining changes:
  - debian/patches:
    + 0099-as-needed-fix.patch: Move -latomic to the right part of the link
      line to resolve FTBFS with as-needed on -latomic arches like powerpc.
    + 0099-libOpenImageIO-underlinked.patch: Link libOpenImageIO with -ldl.
    + fix-build-without-iv.patch: Fix documentation build when building
      without iv.
  - debian/control: Disable iv build on armhf (by excluding that architecture
    from the libqt4-opengl-dev build-dependency), due to a GLfloat/GLdouble
    type conflict.
* debian/patches/0099-libOpenImageIO-underlinked.patch: Link libutil against
  libdl as well (from dpkg-shlibdeps warnings).