Fix OpenCVConfig.cmake for Arch Linux.

cmake/templates/OpenCVConfig.cmake.in

@@ -76,7 +76,7 @@ endif()
 
 # Extract the directory where *this* file has been installed (determined at cmake run-time)
 # Get the absolute path with no ../.. relative marks, to eliminate implicit linker warnings
-set(OpenCV_CONFIG_PATH "${CMAKE_CURRENT_LIST_DIR}")
+get_filename_component(OpenCV_CONFIG_PATH "${CMAKE_CURRENT_LIST_DIR}" REALPATH)
 get_filename_component(OpenCV_INSTALL_PATH "${OpenCV_CONFIG_PATH}/@OpenCV_INSTALL_PATH_RELATIVE_CONFIGCMAKE@" REALPATH)
 
 # Search packages for host system instead of packages for target system.