x86: Add a dummy setjmp implementation for x86_64

We don't have the code for this yet. Add a dummy version for now, so that
EFI builds correctly.

Signed-off-by: Simon Glass <sjg@chromium.org>
Revie

x86: Add a dummy setjmp implementation for x86_64

We don't have the code for this yet. Add a dummy version for now, so that
EFI builds correctly.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

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