Fixed a bug in oryol.cmake when source list was empty
Fixed a bug in oryol.cmake when source list was empty

xfxdev/oryol,floooh/oryol,tempbottle/oryol,aonorin/oryol,wangscript/oryol,aonorin/oryol,code-disaster/oryol,tempbottle/oryol,code-disaster/oryol,zhakui/oryol,xfxdev/oryol,zhakui/oryol,tempbottle/oryol,bradparks/oryol,mgerhardy/oryol,zhakui/oryol,aonorin/oryol,mgerhardy/oryol,ejkoy/oryol,ejkoy/oryol,aonorin/oryol,ejkoy/oryol,bradparks/oryol,wangscript/oryol,zhakui/oryol,code-disaster/oryol,mgerhardy/oryol,zhakui/oryol,floooh/oryol,code-disaster/oryol,mgerhardy/oryol,xfxdev/oryol,bradparks/oryol,aonorin/oryol,waywardmonkeys/oryol,mgerhardy/oryol,floooh/oryol,waywardmonkeys/oryol,tempbottle/oryol,ejkoy/oryol,wangscript/oryol,waywardmonkeys/oryol,code-disaster/oryol,waywardmonkeys/oryol,mgerhardy/oryol,ejkoy/oryol,wangscript/oryol,tempbottle/oryol,waywardmonkeys/oryol,wangscript/oryol,code-disaster/oryol,zhakui/oryol,bradparks/oryol,wangscript/oryol,aonorin/oryol,waywardmonkeys/oryol,floooh/oryol,waywardmonkeys/oryol,ejkoy/oryol,bradparks/oryol,bradparks/oryol,xfxdev/oryol,zhakui/oryol,ejkoy/oryol,floooh/oryol,mgerhardy/oryol,aonorin/oryol,xfxdev/oryol,wangscript/oryol,tempbottle/oryol,floooh/oryol,xfxdev/oryol,code-disaster/oryol,bradparks/oryol,xfxdev/oryol,tempbottle/oryol