[libcxx] [test] Add an option to ssh.py for using a different temp path

If cross testing on Windows via WSL (at least with WSL 1), the Windows
executables can't be executed if they are in WSL specific directories
(like /tmp).

Differential Revision: https://reviews.llvm.org/D98028

GitOrigin-RevId: 232fec941d2301165ea20ba8e6970bdf3c515c84
1 file changed