gitlab: Disable SDL when building sandbox
I am not sure how to add libsdl2-dev to the gitlab image, so disable
building sandbox with SDL for now.
Signed-off-by: 
Simon Glass <sjg@chromium.org>
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I am not sure how to add libsdl2-dev to the gitlab image, so disable
building sandbox with SDL for now.
Signed-off-by: Simon Glass <sjg@chromium.org>