skbuild: Use "." for PY_SITE_PACKAGES

With scikit-build 0.7 or later, the CMAKE_INSTALL_PREFIX has changed
from the previous value. Use a relative current directory to install
inside CMAKE_INSTALL_PREFIX, which skbuild puts into the package.

It cannot be an absolute path to CMAKE_INSTALL_PREFIX because skbuild
puts the files into the "data" package data directory.

Author: thewtex

scripts/internal/manylinux-build-wheels.sh

@@ -94,7 +94,7 @@ for PYBIN in "${PYBINARIES[@]}"; do
           -DWRAP_ITK_INSTALL_COMPONENT_IDENTIFIER:STRING=PythonWheel \
           -DWRAP_ITK_INSTALL_COMPONENT_PER_MODULE:BOOL=ON \
           -DITK_WRAP_unsigned_short:BOOL=ON \
-          -DPY_SITE_PACKAGES_PATH:PATH=${SKBUILD_CMAKE_INSTALL_PREFIX} \
+          -DPY_SITE_PACKAGES_PATH:PATH="." \
           -DITK_LEGACY_SILENT:BOOL=ON \
           -DITK_WRAP_PYTHON:BOOL=ON \
           -DITK_WRAP_PYTHON_LEGACY:BOOL=OFF \

scripts/macpython-build-wheels.sh

@@ -80,7 +80,6 @@ for VENV in "${VENVS[@]}"; do
     source_path=${SCRIPT_DIR}/../standalone-build/ITK-source
     build_path="${SCRIPT_DIR}/../ITK-${py_mm}-macosx_x86_64"
     SETUP_PY_CONFIGURE="${script_dir}/setup_py_configure.py"
-    SKBUILD_CMAKE_INSTALL_PREFIX=$(${PYTHON_EXECUTABLE} -c "from skbuild.constants import CMAKE_INSTALL_DIR; print(CMAKE_INSTALL_DIR)")
 
     # Clean up previous invocations
     rm -rf ${build_path}
@@ -131,7 +130,7 @@ for VENV in "${VENVS[@]}"; do
           -DPYTHON_LIBRARY:FILEPATH=${PYTHON_LIBRARY} \
           -DWRAP_ITK_INSTALL_COMPONENT_IDENTIFIER:STRING=PythonWheel \
           -DWRAP_ITK_INSTALL_COMPONENT_PER_MODULE:BOOL=ON \
-          -DPY_SITE_PACKAGES_PATH:PATH=${SKBUILD_CMAKE_INSTALL_PREFIX} \
+          "-DPY_SITE_PACKAGES_PATH:PATH=." \
           -DITK_LEGACY_SILENT:BOOL=ON \
           -DITK_WRAP_PYTHON:BOOL=ON \
           -DITK_WRAP_PYTHON_LEGACY:BOOL=OFF \

scripts/windows_build_wheels.py

@@ -74,8 +74,6 @@ def build_wrapped_itk(
         script_file.close()
         os.remove(script_file.name)
 
-    py_site_packages_path = os.path.join(ROOT_DIR, "_skbuild", "cmake-install")
-
     # Build ITK python
     with push_dir(directory=build_path, make_directory=True), \
             push_env(**build_env):
@@ -93,7 +91,7 @@ def build_wrapped_itk(
             "-DPYTHON_LIBRARY:FILEPATH=%s" % python_library,
             "-DWRAP_ITK_INSTALL_COMPONENT_IDENTIFIER:STRING=PythonWheel",
             "-DWRAP_ITK_INSTALL_COMPONENT_PER_MODULE:BOOL=ON",
-            "-DPY_SITE_PACKAGES_PATH:PATH=%s" % py_site_packages_path,
+            "-DPY_SITE_PACKAGES_PATH:PATH=.",
             "-DITK_LEGACY_SILENT:BOOL=ON",
             "-DITK_WRAP_PYTHON:BOOL=ON",
             "-DITK_WRAP_PYTHON_LEGACY:BOOL=OFF",