Merge pull request #25257 from Kumataro:fix25256

3rdparty: libtiff: fix for small version expression problems for built-in tiff460 #25257

Close #25256

1. fix to show build-int libtiff version
2. fix to set value of LIBTIFF_VERSION define.

(RELEASE-DATE file coms from original libtiff 4.6.0)

### Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [x] The PR is proposed to the proper branch
- [x] There is a reference to the original bug report and related work
- [ ] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [ ] The feature is well documented and sample code can be built with the project CMake

cmake/OpenCVFindLibsGrfmt.cmake

@@ -124,13 +124,13 @@ if(WITH_TIFF)
   endif()
 
   if(NOT TIFF_VERSION_STRING AND TIFF_INCLUDE_DIR)
-    list(GET TIFF_INCLUDE_DIR 0 _TIFF_INCLUDE_DIR)
-    if(EXISTS "${_TIFF_INCLUDE_DIR}/tiffvers.h")
-      file(STRINGS "${_TIFF_INCLUDE_DIR}/tiffvers.h" tiff_version_str REGEX "^#define[\t ]+TIFFLIB_VERSION_STR[\t ]+\"LIBTIFF, Version .*")
-      string(REGEX REPLACE "^#define[\t ]+TIFFLIB_VERSION_STR[\t ]+\"LIBTIFF, Version +([^ \\n]*).*" "\\1" TIFF_VERSION_STRING "${tiff_version_str}")
-      unset(tiff_version_str)
-    endif()
-    unset(_TIFF_INCLUDE_DIR)
+    foreach(_TIFF_INCLUDE_DIR IN LISTS TIFF_INCLUDE_DIR)
+      if(EXISTS "${_TIFF_INCLUDE_DIR}/tiffvers.h")
+        file(STRINGS "${_TIFF_INCLUDE_DIR}/tiffvers.h" tiff_version_str REGEX "^#define[\t ]+TIFFLIB_VERSION_STR[\t ]+\"LIBTIFF, Version .*")
+        string(REGEX REPLACE "^#define[\t ]+TIFFLIB_VERSION_STR[\t ]+\"LIBTIFF, Version +([^ \\n]*).*" "\\1" TIFF_VERSION_STRING "${tiff_version_str}")
+        unset(tiff_version_str)
+      endif()
+    endforeach()
   endif()
 
   set(HAVE_TIFF YES)