[Bug target/100293] MinGW-w64 of nvptx offload engine fails

[brechtsanders at users dot sourceforge.net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100293

--- Comment #6 from Brecht Sanders <brechtsanders at users dot sourceforge.net> ---
Yes, that folder exists and that's where my TMP and TEMP environment variables
point to.

I also tried to point them to a folder on the C: drive, as R: is a RAM drive
and I wanted to exclude that that was the issue, but the result was the same:
build fails in the same place when configuring libatomic.