[techne/f16] (4 commits) ...Update to 0.2.3 (among other things it fixes build issues with GCC 4.7) Added new BuildRequires on p

[Tadej Janež]

Summary of changes:

  2d5b4bf... Rebuild for new libpng (*)
  ecddbeb... Rebuild for new GCC 4.7.x Dropped obsolete versioned BuildR (*)
  0f81b8f... Rebuild for new ImageMagick (6.7.5.x) (*)
  321c3e2... Update to 0.2.3 (among other things it fixes build issues w (*)

(*) This commit already existed in another branch; no separate mail sent