In the multi branch pipeline, the scm path is percent encoded and used as a folder name.
This percent encoding cause fail with visual studio C++ build.

For my this is an issue of Visual studio, so I have created an issue here
https://connect.microsoft.com/VisualStudio/feedback/details/3088472

But it seems that encoding cause troubles in others softwares
https://issues.jenkins-ci.org/browse/JENKINS-37045?jql=text%20~%20%22%252f%22