linux-user: Add gen-vdso tool

This tool will be used for post-processing the linked vdso image,
turning it into something that is easy to include into elfload.c.

Reviewed-by: Philippe Mathieu-Daudé

linux-user: Add gen-vdso tool

This tool will be used for post-processing the linked vdso image,
turning it into something that is easy to include into elfload.c.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

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