BUG: apply ITK PR #6150 - use check_symbol_exists for TIFFFieldReadCount detection

[blowekamp]

Summary

Applies the fix from upstream ITK PR InsightSoftwareConsortium/ITK#6150 as a recipe patch.

Bug

When building with ITK_USE_SYSTEM_TIFF=ON (always the case in this feedstock), the CMake detection of TIFFFieldReadCount used check_type_size(), which internally calls sizeof() on the argument. Passing a function name to sizeof() is non-standard — GCC and Clang accept it as an extension, but MSVC rejects it — so ITK_TIFF_HAS_TIFFFieldReadCount was never defined on Windows builds.

Without that define, itkTIFFImageIO falls through to a libtiff 4.0.0–4.0.2 workaround that directly accesses the internal _TIFFField struct. That struct layout is no longer correct for modern libtiff versions, causing reads of garbage data and NULL pointer crashes when encountering tags with unsupported data types (e.g. an ICC profile tag).

Fixes: InsightSoftwareConsortium/ITK#6148

Fix

Replace check_type_size(TIFFFieldReadCount ...) with check_symbol_exists(TIFFFieldReadCount "tiffio.h" ...) in Modules/ThirdParty/TIFF/CMakeLists.txt, which correctly detects the function symbol on all compilers.

Changes

• recipe/0001-BUG-use-check_symbol_exists-for-TIFFFieldReadCount.patch — new patch applying the upstream fix
• recipe/meta.yaml — add patches: list, bump build number 2 → 3

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe/meta.yaml) and found it was in an excellent condition.

I do have some suggestions for making it better though...

For recipe/meta.yaml:

• ℹ️ The recipe is not parsable by parser conda-souschef (grayskull). This parser is not currently used by conda-forge, but may be in the future. We are collecting information to see which recipes are compatible with grayskull.
• ℹ️ The recipe is not parsable by parser conda-recipe-manager. The recipe can only be automatically migrated to the new v1 format if it is parseable by conda-recipe-manager.
• ℹ️ top-level output has some malformed specs:

• In section build: cmake >=3.16.3, <3.30.0
  Requirement spec fields should match the syntax name [version [build]]to avoid known issues in conda-build. For example, instead of name =version=build, use name version.* build. There should be no spaces between version operators and versions either: python >= 3.8 should be python >=3.8.

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