ENH: Update NrrdIO from upstream

The NrrdIO repository recently moved to git

```
git clone https://git.code.sf.net/p/teem/nrrdio/nrrdio.git NrrdIO
```

These changes represent the head of NrrdIO as of 2025-10-22, with
synchronization between the ITK codebase and the NrrdIO codebase.

Author: hjmjohnson

Modules/ThirdParty/NrrdIO/src/CMakeLists.txt

@@ -3,5 +3,24 @@ set(ITK3P_INSTALL_INCLUDE_DIR "${ITKNrrdIO_INSTALL_INCLUDE_DIR}")
 set(ITK3P_INSTALL_RUNTIME_DIR "${ITKNrrdIO_INSTALL_RUNTIME_DIR}")
 set(ITK3P_INSTALL_LIBRARY_DIR "${ITKNrrdIO_INSTALL_LIBRARY_DIR}")
 set(ITK3P_INSTALL_ARCHIVE_DIR "${ITKNrrdIO_INSTALL_ARCHIVE_DIR}")
+
+set(NRRDIO_PREFIX ITK)
+# ZLIB:
+set(NRRDIO_USE_ZLIB  OFF)
+set(TEEM_ITK_MANGLE 1) # Needed to generate public facing ITKNrrdIO.h from ITKNrrdIO.h.in with TEEM_ITK_MANGLE=1 always
+add_definitions(-DTEEM_ITK_MANGLE=${TEEM_ITK_MANGLE}) # Needed for privateNrrd.h (only used when building library, no public api).
+add_definitions(-DTEEM_ZLIB=1) # Force setting zlib support here
+set(ZLIB_INCLUDE_DIR ${ITKZLIB_INCLUDE_DIRS})
+set(ZLIB_LIBRARY ${ITKZLIB_LIBRARIES})
+list(APPEND NRRDIO_COMPRESSION_LIBRARIES ${ITKZLIB_LIBRARIES})
+if(UNIX)
+    list(APPEND NRRDIO_COMPRESSION_LIBRARIES m)
+    list(REMOVE_DUPLICATES NRRDIO_COMPRESSION_LIBRARIES)
+endif()
+
+# BZIP2
+set(NRRDIO_USE_BZIP2 OFF) # Not yet supported in ITK
+add_definitions(-UTEEM_BZIP2) # Force unsetting bzip2 support here
+
 add_subdirectory(NrrdIO)
 itk_module_target(ITKNrrdIO NO_INSTALL)