The U-Boot library can be used from Rust fairly easily. Add an example
for this, following along the lines of the existing ulib example.
Note that the new way of representing C strings is not used for now,
since it is not available in v1.75 of cargo, as shipped by Ubuntu 24.04
Co-developed-by: Claude <noreply@anthropic.com>
Co-developed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
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