Revert back to libpng 1.6.27
Revert back to libpng 1.6.27

Components: Framework

Change-Id: I6576aeff8d0a1c9375f829518cb4035c53af5e82
(cherry picked from commit f3b873529b8f1b62e8a79055045c1a368ce21ea4)

KhronosGroup/VK-GL-CTS,KhronosGroup/Vulkan-CTS,KhronosGroup/VK-GL-CTS,KhronosGroup/Vulkan-CTS,KhronosGroup/VK-GL-CTS,KhronosGroup/VK-GL-CTS,KhronosGroup/VK-GL-CTS,KhronosGroup/Vulkan-CTS,KhronosGroup/Vulkan-CTS,KhronosGroup/VK-GL-CTS,KhronosGroup/Vulkan-CTS,KhronosGroup/Vulkan-CTS