Replaced our usage of LINK_PRIVATE with that of LINK_INTERFACE_LIBRARIES.

The reasons for that are twofold:

1) LINK_PRIVATE is only available since CMake 2.8.7.
2) The way it was used generated a warning because of CMake policy CMP0023:

   http://www.cmake.org/cmake/help/v2.8.12/cmake.html#policy:CMP0023

Using LINK_INTERFACE_LIBRARIES actually causes another warning - this time
because of CMake policy CMP0022:

   http://www.cmake.org/cmake/help/v2.8.12/cmake.html#policy:CMP0022

I set the policy to OLD, because NEW means subtle changes when compiling
with CMake 2.8.12, and I don't want to research that this close to release.
:-)

I also removed the setting of CMP0003, because it's set by
cmake_minimal_version anyway.

CMakeLists.txt

@@ -11,15 +11,6 @@
 
 set(CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS true)
 
-# --------------------------------------------------------------
-# Indicate CMake 2.7 and above that we don't want to mix relative
-#  and absolute paths in linker lib lists.
-# Run "cmake --help-policy CMP0003" for more information.
-# --------------------------------------------------------------
-if(COMMAND cmake_policy)
-  cmake_policy(SET CMP0003 NEW)
-endif()
-
 # Following block can broke build in case of cross-compilng
 # but CMAKE_CROSSCOMPILING variable will be set only on project(OpenCV) command
 # so we will try to detect crosscompiling by presense of CMAKE_TOOLCHAIN_FILE
@@ -48,6 +39,10 @@ else()
   cmake_minimum_required(VERSION 2.6.3)
 endif()
 
+if(POLICY CMP0022)
+  cmake_policy(SET CMP0022 OLD)
+endif()
+
 # must go before the project command
 set(CMAKE_CONFIGURATION_TYPES "Debug;Release" CACHE STRING "Configs" FORCE)
 if(DEFINED CMAKE_BUILD_TYPE AND CMAKE_VERSION VERSION_GREATER "2.8")

cmake/OpenCVModule.cmake

@@ -535,9 +535,10 @@ macro(ocv_create_module)
 
   if(NOT "${ARGN}" STREQUAL "SKIP_LINK")
     target_link_libraries(${the_module} ${OPENCV_MODULE_${the_module}_DEPS})
-    target_link_libraries(${the_module} LINK_PRIVATE ${OPENCV_MODULE_${the_module}_DEPS_EXT} ${OPENCV_LINKER_LIBS} ${IPP_LIBS} ${ARGN})
+    target_link_libraries(${the_module} LINK_INTERFACE_LIBRARIES ${OPENCV_MODULE_${the_module}_DEPS})
+    target_link_libraries(${the_module} ${OPENCV_MODULE_${the_module}_DEPS_EXT} ${OPENCV_LINKER_LIBS} ${IPP_LIBS} ${ARGN})
     if (HAVE_CUDA)
-      target_link_libraries(${the_module} LINK_PRIVATE ${CUDA_LIBRARIES} ${CUDA_npp_LIBRARY})
+      target_link_libraries(${the_module} ${CUDA_LIBRARIES} ${CUDA_npp_LIBRARY})
     endif()
   endif()