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

Change-Id: I367a880669138406e715e8574543b1d54754b0ba

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