Added a compatibility fix for DUB packages.
Added a compatibility fix for DUB packages.

DUB needs an explicit dependency to vibe.d if an application uses it, while 'vibe' doesn't. With this fix, vibe.d is not downloaded in this case.

redstar/vibe.d,fast4shoot/vibe.d,veelo/vibe.d,jkm/vibe.d,machindertechnologies/vibe.d,etcimon/vibe.d,AndreyMZ/vibe.d,DBankov/vibe.d,jkm/vibe.d,sigod/vibe.d,Geod24/vibe.d,Yoplitein/vibe.d,dkillebrew/vibe.d,Mihail-K/vibe.d,alphaKAI/vibe.d,schuetzm/vibe.d,Yoplitein/vibe.d,etcimon/vibe.d,nathanchristenson/vibe.d,Yoplitein/vibe.d,nathanchristenson/vibe.d,yannick/vibe.d,Kozzi11/vibe.d,etcimon/vibe.0,nathanchristenson/vibe.d,mfrischknecht/vibe.d,ColdenCullen/vibe.d,alphaKAI/vibe.d,1100110/vibe.d,gedaiu/vibe.d,etcimon/vibe.0,sigod/vibe.d,alphaKAI/vibe.d,sigod/vibe.d,rejectedsoftware/vibe.d,chalucha/vibe.d