cmake libpng examples

DragonJoker/Castor3D source/Core/CastorUtils/CMakeLists.txt :756 

find_package( libpng CONFIG REQUIRED )

AcademySoftwareFoundation/openvdb openvdb_cmd/vdb_tool/CMakeLists.txt :84 

find_package(libpng CONFIG REQUIRED)

Silverlan/pragma CMakeLists.txt :45 

find_package(libpng REQUIRED)

glKarin/com.n0n3m4.diii4a Q3E/src/main/jni/darkmod/CMakeLists.txt :304 

find_package(libpng REQUIRED)