Merge branch 'fix/dune_symlink_to_source_files-with-named-argument' into 'master'

[cmake] add named argument to dune_symlink_to_source_files

See merge request !2377 (merged)

(cherry picked from commit e3ce6456)

7867e4ea [cmake] add named argument to dune_symlink_to_source_files

test/python/CMakeLists.txt

-dune_symlink_to_source_files(test_py_gridgeometry.py)
+dune_symlink_to_source_files(FILES test_py_gridgeometry.py)
 dune_python_add_test(NAME test_py_gridgeometry
                      COMMAND ${PYTHON_EXECUTABLE} test_py_gridgeometry.py
                      WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
                      LABELS python unit)
 
-dune_symlink_to_source_files(test_py_fvproblem.py)
+dune_symlink_to_source_files(FILES test_py_fvproblem.py)
 dune_python_add_test(NAME test_py_fvproblem
                      COMMAND ${PYTHON_EXECUTABLE} test_py_fvproblem.py
                      WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}