onnxruntime

4f6ae14e - Add build.py `--targets` option to specify multiple targets. Update existing list-valued options to use argparse "extend" action. (#25718)

Add build.py `--targets` option to specify multiple targets. Update existing list-valued options to use argparse "extend" action. (#25718) ### Description <!-- Describe your changes. --> - Add build.py `--targets` option to specify multiple targets. - Update existing list-valued options to use argparse "extend" action. Unlike "append", "extend" won't create nested lists. ### Motivation and Context <!-- - Why is this change required? What problem does it solve? - If it fixes an open issue, please link to the issue here. --> Allow multiple targets to be specified. Use newer argparse feature to simplify option handling.