tree 6afdcac3b09aa557ca76b84667f86d6982420a0e
parent 21e60da5bb0715e09f2feba5930ea2c8bc8180af
author Brad King <brad.king@kitware.com> 1580834242 -0500
committer Brad King <brad.king@kitware.com> 1580834778 -0500

VS: Do not use native unity builds on VS 2017 versions less than 15.8

VS 2017 version 15.8 introduced support for unity builds implemented
in part by the `$(VCTargetsPath)/Microsoft.Cpp.Unity.targets` file.
Do not enable unity builds on VS 15 versions that do not have that file.

Fixes: #20284