Only reschedule the GC collection timer from the main thread. Fixes #1476.
Only reschedule the GC collection timer from the main thread. Fixes #1476.

Geod24/vibe.d,etcimon/vibe.d,AndreyMZ/vibe.d,Mihail-K/vibe.d,gedaiu/vibe.d,DBankov/vibe.d,etcimon/vibe.d,rejectedsoftware/vibe.d,chalucha/vibe.d,schuetzm/vibe.d