Release of cc-rs 1.2.8 breaks mpi-sys on Mac

[tbetcke]

Version 1.2.8 of cc-rs has just been released. It slightly changed handling of compiler wrappers on Mac and in the process a number of clang compiler wrappers are broken. mpi-sys compilation on my Mac OS 15.2 fails with the error message that the mpi include directory cannot be found. Downgrading to 1.2.7 of cc-rs fixes the issue.

I have added a comment to the discussion at rust-lang/cc-rs#1328.

[tbetcke]

The issue has been fixed in cc-rs version 1.2.9.

rust-lang/cc-rs#1365

[jedbrown]

Do we need to bump dependencies or is it safe to say people will either get the old version or the latest version?