linux-user/loongarch64: Add vdso

Requires a relatively recent binutils version in order to avoid
spurious R_LARCH_NONE relocations. The presence of these relocs
are diagnosed by our gen-vdso tool.

linux-user/loongarch64: Add vdso

Requires a relatively recent binutils version in order to avoid
spurious R_LARCH_NONE relocations. The presence of these relocs
are diagnosed by our gen-vdso tool.

Tested-by: Song Gao <gaosong@loongson.cn>
Reviewed-by: Song Gao <gaosong@loongson.cn>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

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