[Bug bootstrap/57076] @ in the src directory name causes failure while building of gcc.info

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57076

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Maybe the best thing would be reject this during configure.

This showed up because I enabled in jenkins overlapping builds