fixed OpenCVConfig for cross-compilation:

* added CUDA to EXTRA libs if OpenCV uses it
* added -rpath-link option for linker if OpenCV was built as SHARED libs

cmake/templates/OpenCVConfig.cmake.in

@@ -221,7 +221,7 @@ foreach(__opttype OPT DBG)
   endif()
 
   # CUDA
-  if(OpenCV_CUDA_VERSION AND WIN32 AND NOT OpenCV_SHARED)
+  if(OpenCV_CUDA_VERSION AND (CMAKE_CROSSCOMPILING OR (WIN32 AND NOT OpenCV_SHARED)))
     if(NOT CUDA_FOUND)
       find_package(CUDA ${OpenCV_CUDA_VERSION} EXACT REQUIRED)
     else()
@@ -304,3 +304,11 @@ else()
   SET(OpenCV_LIB_DIR ${OpenCV_LIB_DIR_OPT} ${OpenCV_3RDPARTY_LIB_DIR_OPT})
 endif()
 set(OpenCV_LIBRARIES ${OpenCV_LIBS})
+
+if(CMAKE_CROSSCOMPILING AND OpenCV_SHARED AND (CMAKE_SYSTEM_NAME MATCHES "Linux"))
+  foreach(dir ${OpenCV_LIB_DIR})
+    set(CMAKE_EXE_LINKER_FLAGS    "${CMAKE_EXE_LINKER_FLAGS}    -Wl,-rpath-link,${dir}")
+    set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-rpath-link,${dir}")
+    set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -Wl,-rpath-link,${dir}")
+  endforeach()
+endif()