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由 Richard Henderson 提交于
Do not require the submodule, but use it if present. Allow the command-line to override system or git submodule either way. Tested-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org> Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>
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