VS: Add special case for '-T version=18.104.22.168' under VS 16.10
Extend the table of special cases from !5903 (merged). Add a special case for the name VS 16.11 will use for VS 16.10's default toolset, so that it can be used with VS 16.10 too.
Using '-T version=22.214.171.124' actually works under VS 16.10 without this change, but only because there is only one 14.29 toolset so the two-component prefix happens to match the right one. Make it explicit.
Issue: #21922 (closed)