manylinux-build-wheels: Fix PY_SITE_PACKAGES_PATH value

Author: jcfr

scripts/internal/manylinux-build-wheels.sh

@@ -79,7 +79,7 @@ for PYBIN in "${PYBINARIES[@]}"; do
           -DCMAKE_CXX_COMPILER_TARGET:STRING=$(uname -p)-linux-gnu \
           -DWRAP_ITK_INSTALL_COMPONENT_IDENTIFIER:STRING=PythonWheel \
           -DWRAP_ITK_INSTALL_COMPONENT_PER_MODULE:BOOL=ON \
-          -DPY_SITE_PACKAGES_PATH:PATH=${SCRIPT_DIR}/../_skbuild/cmake-install \
+          -DPY_SITE_PACKAGES_PATH:PATH=${script_dir}/../_skbuild/cmake-install \
           -DITK_LEGACY_SILENT:BOOL=ON \
           -DITK_WRAP_PYTHON:BOOL=ON \
           -DITK_WRAP_PYTHON_LEGACY:BOOL=OFF \