[Bug target/85142] Wrong -print-multi-os-directory & -print-multi-lib output for riscv64 + multilib

[joseph at codesourcery dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85142

--- Comment #8 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
"." is correct for the default multilib in the non-OS directory 
arrangements, just not in the OS directory arrangements.