test cases/common/252 install data structured/pysrc/meson.build

py_inst = import('python').find_installation()

py_inst.install_sources(
    '__init__.py',
    'foo.py',
    'bar.py',
    'submod/__init__.py',
    'submod/baz.py',
    subdir: 'mod',
    preserve_path: true,
)