3rdParty/libpng: SKIP_INSTALL_ALL

We do not need to create any install targets when using libpng from
source.

3rdParty/libpng/CMakeLists.txt

@@ -17,7 +17,7 @@ else()
 endif()
 set(PNG_TESTS OFF)
 set(PNG_EXECUTABLES OFF)
-set(SKIP_INSTALL_PROGRAMS ON)
+set(SKIP_INSTALL_ALL ON)
 
 if(IOS AND "${CMAKE_OSX_ARCHITECTURES}" STREQUAL "arm64")
   set(PNG_ARM_NEON "on" CACHE STRING "" FORCE)