fixed find package CUDA for cross-compilation

replaced find_host_package with find_package and
set CMAKE_FIND_ROOT_PATH_MODE_LIBRARY to BOTH, because NEVER 
doesn't work for CUDA_CUDA_LIBRARY, which is located in 
/usr/arm-linux-gnueabihf/lib/libcuda.so for ARM

cmake/OpenCVDetectCUDA.cmake

@@ -15,7 +15,11 @@ endif()
 
 set(CMAKE_MODULE_PATH "${OpenCV_SOURCE_DIR}/cmake" ${CMAKE_MODULE_PATH})
 
-find_host_package(CUDA 4.2 QUIET)
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY BOTH)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE NEVER)
+
+find_package(CUDA 4.2 QUIET)
 
 if(CUDA_FOUND)
   set(HAVE_CUDA 1)