Remove unused code that throws a warning on DMD 2.069.0-b2.
Remove unused code that throws a warning on DMD 2.069.0-b2.

grogancolin/dub,gedaiu/dub,jeanbaptistelab/dub,xentec/dub,jelmansouri/dub,Geod24/dub,Flamaros/dub,D-Programming-Language/dub,p0nce/dub,rjframe/dub