Comment 6 for bug 821210

Your patch file was not possible to apply, because it was for old version of stratagus. It was against file png.c, but in stratagus is now png.cpp (and has other structure). So I modified file png.cpp manually.

Chnages is in this commit: http://bazaar.launchpad.net/~stratagus/stratagus/trunk/revision/7993
Check if all png erros is fixed.