Creates a new #GSubprocessLauncher.
The launcher is created with the default options. A copy of the environment of the calling process is made at the time of this call and will be used as the environment that the process is launched in.
#GSubprocessFlags
Creates a new #GSubprocessLauncher.
The launcher is created with the default options. A copy of the environment of the calling process is made at the time of this call and will be used as the environment that the process is launched in.