Update vtkpng from libpng-1.0.12 to libpng-1.0.63.
All versions of libpng prior to 1.0.16 had severe security flaws.
Renamed pngDllConfig.h to vtkpngConfig.h to make it clear that this header is for VTK.
GitLab update will be applied on June 25th, between 8am and 10am, EDT (UTC-04:00). This site may have intermittent delays during that time.
All versions of libpng prior to 1.0.16 had severe security flaws.
Renamed pngDllConfig.h to vtkpngConfig.h to make it clear that this header is for VTK.