CMake touch ups for BUILD_opencv_world=ON

Author: headupinclouds

modules/world/CMakeLists.txt

@@ -70,11 +70,11 @@ if(IOS OR APPLE)
   endmacro()
 
   if(WITH_PNG)
-    ios_include_3party_libs(zlib libpng)
+    ios_include_3party_libs(${ZLIB_LIBRARIES} ${PNG_LIBRARIES})
   endif()
 
   if(WITH_JPEG)
-    ios_include_3party_libs(libjpeg)
+    ios_include_3party_libs(${JPEG_LIBRARIES})
   endif()
 
   add_custom_command(TARGET ${the_module} POST_BUILD