Install host versions of CLib & C++Lib
Update InstallTools to install the host versions of CLib & C++Lib (headers & libraries) in Library.Acorn.HostLibs. This will provide the HostTools makefile (& friends) access to them, shielding them against any incompatibilities between (e.g.) the host CLib stubs and the target CLib stubs.
See also BuildSys!61 (merged) and Env!17 (merged)