loplugin:stringconstant: handle OUString+=OUString(literal)
loplugin:stringconstant: handle OUString+=OUString(literal)

Change-Id: Ib9bf6e0919ee0cab02d826859317ea20cb64cabb

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