Sets the flags on the launcher.
The default flags are g_subprocess_flags_none.
You may not set flags that specify conflicting options for how to handle a particular stdio stream (eg: specifying both g_subprocess_flags_stdin_pipe and g_subprocess_flags_stdin_inherit).
You may also not set a flag that conflicts with a previous call to a function like set_stdin_file_path or take_stdout_fd.
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