Removes WriteLn() statement in GDI backend
Removes WriteLn() statement in GDI backend

Us SendDebug() instead - which means it will not cause a problem on
Windows non-console applications.

wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI