http: Remove WaitExit from WorkQueue
http: Remove WaitExit from WorkQueue

This function, which waits for all threads to exit, is no longer needed
now that threads are joined instead.

Signed-off-by: Wladimir J. van der Laan <bbc07dc96bb50bf6868a2ddfc4dae14fbed703d9@gmail.com>

PIVX-Project/PIVX,PIVX-Project/PIVX,Darknet-Crypto/Darknet,PIVX-Project/PIVX,Darknet-Crypto/Darknet,PIVX-Project/PIVX,PIVX-Project/PIVX,PIVX-Project/PIVX,PIVX-Project/PIVX,Darknet-Crypto/Darknet,Darknet-Crypto/Darknet,PIVX-Project/PIVX,Darknet-Crypto/Darknet,Darknet-Crypto/Darknet,PIVX-Project/PIVX