configure: add cpuflags for loongson3 series cpu
Signed-off-by: ZhouXiaoyong <zhouxiaoyong@loongson.cn> Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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Signed-off-by: ZhouXiaoyong <zhouxiaoyong@loongson.cn> Signed-off-by: Michael Niedermayer <michaelni@gmx.at>