Clean up gb_Library_set_componentfile argument handling.
Clean up gb_Library_set_componentfile argument handling.

It is only ever called with 2, never with 3 arguments.  And the
gb_ComponentTarget_ComponentTarget it calls only takes 3, not 4 arguments.

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core