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

3rdparty/libtiff/CMakeLists.txt

@@ -361,6 +361,7 @@ set(LIBTIFF_MAJOR_VERSION "4")
 set(LIBTIFF_MINOR_VERSION "6")
 set(LIBTIFF_MICRO_VERSION "0")
 set(LIBTIFF_VERSION "${LIBTIFF_MAJOR_VERSION}.${LIBTIFF_MINOR_VERSION}.${LIBTIFF_MICRO_VERSION}")
+file(READ "RELEASE-DATE" LIBTIFF_RELEASE_DATE content)
 
 set(TIFF_MAX_DIR_COUNT "1048576")
 
@@ -427,7 +428,7 @@ set(lib_srcs
     tiff.h
     tiffio.h
     tiffiop.h
-    tiffvers.h
+    "${CMAKE_CURRENT_BINARY_DIR}/tiffvers.h"
     uvcode.h
     tiffio.hxx
     "${CMAKE_CURRENT_BINARY_DIR}/tif_config.h"

3rdparty/libtiff/RELEASE-DATE

@@ -0,0 +1 @@
+20230908

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)
+    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()
-    unset(_TIFF_INCLUDE_DIR)
+    endforeach()
   endif()
 
   set(HAVE_TIFF YES)