gcc: Fix riscv multilib issues in plain toolchains

RISC-V multilib currently doesn't work at all. We could disable multilib for
the riscv platform but that would then behave differently to all our others.
Instead, copy the non-multilib config over the multilib config for now for
riscv, meaning we can keep the platforms similar.

This isn't quite enough as the triplet specific c++ headers are in the wrong
place leading to compiler issues and testimage failures. Work around that too
until someone adds full multilib support for the platform (if desired).

(From OE-Core rev: 3081f62c18fcee642ab43efa717c8f71d51ae587)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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