v141 toolchain support (VS2017) and examples of building a single dll#59

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boczar wants to merge 4 commits intoaspnet:mainfrom

boczar:alexboc/vs2017

Commits on Apr 28, 2021

vs2017 compile fixes
Alexander Boczar
committed

Commits on Apr 29, 2021

Added triplet for unspecific toolchain version.
Alexander Boczar
committed

Commits on May 21, 2021

Merge branch 'main' of https://github.com/boczar/SignalR-Client-Cpp into main
Alexander Boczar
committed
Updated build script
Alexander Boczar
committed