Fix white edges problem (PNG _is_ non premul, OpenGL _wants_ premul).
All transparent pixels must be fully black or sampling near edges will show errors. Irrlicht or something else should had enforced premul rules... Rough steps in GIMP: 1) Add Layer Mask using "Transfer layer's alpha channel". 2) Disable Layer Mask. 3) Select all white zone (tricky if eyes near edge, otherwise easy). 4) Fill with black. 5) Apply Layer Mask. git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@6993 178a84e3-b1eb-0310-8ba1-8eac791a3b58
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