2014-01-24 12:35 UTC+0100 Przemyslaw Czerpak (druzus/at/poczta.onet.pl)
  * src/3rd/png/*
  * src/3rd/png/Makefile
  * src/3rd/png/pnglconf.h
  * src/3rd/png/png.dif
    * updated libpng 1.6.1 -> 1.6.8
    ; modifications below taken from Viktor branch
         Warning: some of them may cause problems with 3-rd party
                  code which needs fully functional libpng.
    * disabled PNG_CONSOLE_IO_SUPPORTED build option.
      (MSVS 2013 doesn't support 'stderr' constant)
    * disabled STDIO dependent parts for all platforms
    * disabled PNG_CONVERT_tIME_SUPPORTED to avoid using
      unsafe RTL calls (as shown by msvc)
Merge https://github.com/harbour/core