[libpng16] Imported from libpng-1.6.4.tar
[libpng16] Bump version to 1.6.5beta01
[libpng16] Imported from libpng-1.6.5.tar
[libpng16] Imported from libpng-1.6.6.tar
[libpng16] Bump version to 1.6.7beta01