[OpenSmalltalk/opensmalltalk-vm] e38f6a: Also update version of libpng, pixman and cairo in...

 
  Branch: refs/heads/upgrade_libpng
  Home:   https://github.com/OpenSmalltalk/opensmalltalk-vm
  Commit: e38f6acf530b774cced4fbda2c5f701e8e8493fd
      https://github.com/OpenSmalltalk/opensmalltalk-vm/commit/e38f6acf530b774cced4fbda2c5f701e8e8493fd
  Author: Nicolas Cellier <[hidden email]>
  Date:   2021-01-06 (Wed, 06 Jan 2021)

  Changed paths:
    M cmake/Cairo.cmake
    M cmake/FreeType2.cmake
    M cmake/LibGit2.cmake
    M cmake/LibPNG.cmake
    M cmake/LibSSH2.cmake
    M cmake/Pixman.cmake
    M cmake/PkgConfig.cmake
    M cmake/SDL2.cmake
    M cmake/ThirdPartyDependenciesMacros.cmake

  Log Message:
  -----------
  Also update version of libpng, pixman and cairo in cmake builds

There is no reason why cmake should use a different version.
Use whatever hash is given by hosting sites, this is not necessarily SHA256.
Change the ThirdPartyDependenciesMacros accordingly.