CI: Switch to self-hosted version of boost
CI: Switch to self-hosted version of boost

Sourceforge has gotten sketchy as of late.
Also, switch to curl. wget was having authentication problems with SSL

jklarowicz/FiberTaskingLib,jklarowicz/FiberTaskingLib,underscorediscovery/FiberTaskingLib,Samana/FiberTaskingLib,jklarowicz/FiberTaskingLib,underscorediscovery/FiberTaskingLib,Samana/FiberTaskingLib