Merge pull request opencv#19452 from ctuu:patch-1

* fix: findCUDNN script

* Update FindCUDNN.cmake

Author: ctuu

cmake/FindCUDNN.cmake

@@ -72,14 +72,14 @@ if(CUDNN_INCLUDE_DIR)
   endif()
 
   string(REGEX MATCH "define CUDNN_MAJOR ([0-9]+)" _ "${CUDNN_H_CONTENTS}")
-  set(CUDNN_MAJOR_VERSION ${CMAKE_MATCH_1} CACHE INTERNAL "")
+  set(CUDNN_VERSION_MAJOR ${CMAKE_MATCH_1} CACHE INTERNAL "")
   string(REGEX MATCH "define CUDNN_MINOR ([0-9]+)" _ "${CUDNN_H_CONTENTS}")
-  set(CUDNN_MINOR_VERSION ${CMAKE_MATCH_1} CACHE INTERNAL "")
+  set(CUDNN_VERSION_MINOR ${CMAKE_MATCH_1} CACHE INTERNAL "")
   string(REGEX MATCH "define CUDNN_PATCHLEVEL ([0-9]+)" _ "${CUDNN_H_CONTENTS}")
-  set(CUDNN_PATCH_VERSION ${CMAKE_MATCH_1} CACHE INTERNAL "")
+  set(CUDNN_VERSION_PATCH ${CMAKE_MATCH_1} CACHE INTERNAL "")
 
   set(CUDNN_VERSION
-    "${CUDNN_MAJOR_VERSION}.${CUDNN_MINOR_VERSION}.${CUDNN_PATCH_VERSION}"
+    "${CUDNN_VERSION_MAJOR}.${CUDNN_VERSION_MINOR}.${CUDNN_VERSION_PATCH}"
     CACHE
     STRING
     "cuDNN version"