Load additional .smi file for the initial environment.
This option is useful if you want to make your own library
available in the interactive session.
The library indicated by the given .smi file must be
compiled, in other words, all of the object files constituting the
library must be prepared.
The smlsharp command obtains the object files as if
the .smi file is specified in link mode, link them to a shared
library, and load it through the system facility of dynamic loading.