Add OpenCV_INCLUDE_DIRS to INTERFACE_INCLUDE_DIRECTORIES target property

With this fix there is no need to add includes by using
`include_directories(${OpenCV_INCLUDE_DIRS})`. Directory will be added by
command `target_link_libraries(... ${OpenCV_LIBS})` automatically.

cmake/templates/OpenCVConfig.cmake.in

@@ -7,7 +7,7 @@
 #    In your CMakeLists.txt, add these lines:
 #
 #    find_package(OpenCV REQUIRED)
-#    include_directories(${OpenCV_INCLUDE_DIRS})
+#    include_directories(${OpenCV_INCLUDE_DIRS}) # Not needed for CMake >= 2.8.11
 #    target_link_libraries(MY_TARGET_NAME ${OpenCV_LIBS})
 #
 #    Or you can search for specific OpenCV modules:
@@ -177,6 +177,20 @@ if(OpenCV2_INCLUDE_DIRS)
   endif()
 endif()
 
+if(NOT CMAKE_VERSION VERSION_LESS "2.8.11")
+  # Target property INTERFACE_INCLUDE_DIRECTORIES available since 2.8.11:
+  # * http://www.cmake.org/cmake/help/v2.8.11/cmake.html#prop_tgt:INTERFACE_INCLUDE_DIRECTORIES
+  foreach(__component ${OpenCV_LIB_COMPONENTS})
+    if(TARGET ${__component})
+      set_target_properties(
+          ${__component}
+          PROPERTIES
+          INTERFACE_INCLUDE_DIRECTORIES "${OpenCV_INCLUDE_DIRS}"
+      )
+    endif()
+  endforeach()
+endif()
+
 # ==============================================================
 #  Check OpenCV availability
 # ==============================================================