COMP: Modernize CMake to itk_module_add_library and disable Python wheels

Replace the legacy add_library + itk_module_target + include_directories
pattern with itk_module_add_library, which generates the export header
and propagates its include directory through target interface properties.
This fixes the IOOpenSlideExport.h not-found error when building test
targets in the CTest/dashboard configuration.

Disable the Python wheel workflow because OpenSlide is an external C
library not available in the manylinux Docker containers or Windows
wheel-build environments.

Assisted-by: Claude Code — root-cause analysis of export header include path propagation

Author: hjmjohnson

.github/workflows/build-test-package.yml

@@ -18,7 +18,8 @@ jobs:
       brew-packages: 'openslide'
       os-list: '["ubuntu-22.04", "macos-15-intel", "macos-15"]'
 
-  python-build-workflow:
-    uses: InsightSoftwareConsortium/ITKRemoteModuleBuildTestPackageAction/.github/workflows/build-test-package-python.yml@v5.4.6
-    secrets:
-      pypi_password: ${{ secrets.pypi_password }}
+  # Python wheel builds are disabled because OpenSlide is an external C
+  # library that is not available in the manylinux Docker containers or
+  # the Windows wheel-build environment.  Re-enable when the Python
+  # workflow gains apt-packages / brew-packages support or the module
+  # bundles its own OpenSlide build.

src/CMakeLists.txt

@@ -3,11 +3,6 @@ set(IOOpenSlide_SRCS
   itkOpenSlideImageIO.cxx
   )
 
-include_directories("${IOOpenSlide_SOURCE_DIR}/include")
-include_directories("${CMAKE_CURRENT_BINARY_DIR}")
-include_directories(${OPENSLIDE_INCLUDE_DIRS})
-
-add_library(IOOpenSlide ${IOOpenSlide_SRCS})
+itk_module_add_library(IOOpenSlide ${IOOpenSlide_SRCS})
+target_include_directories(IOOpenSlide PRIVATE ${OPENSLIDE_INCLUDE_DIRS})
 target_link_libraries(IOOpenSlide LINK_PRIVATE ${OPENSLIDE_LIBRARIES})
-itk_module_link_dependencies()
-itk_module_target(IOOpenSlide)