Fix: github action ci qemu compilation failure

[Jzow]

fork branch has been tested and passed

[tencent-adm]

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[nihui]

Thanks for your contribution !

[github-actions]

The binary size change of libncnn.so (bytes)

architecture	base size	pr size	difference
x86_64	15593968	15593968	0 😘
armhf	6602932	6602932	0 😘
aarch64	9983872	9983872	0 😘