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This commit brings kernel and userspace into agreement about squashfs compression algorithms: zlib, xz, lzo, and lz4 (except on S/390 and PPC64LE). Some kernels has LZO, some had LZ4, some had both. Userspace had LZO, but not LZ4. XZ and LZO were added to squashfs-tools in commit 151deb4c Most compression options were added to kernels through default configs: * LZO had been enabled in RPI, RPI2, S/390, PPC64le, and squashfs-tools. * LZ4 had been enabled in x86, x86_64, aarch64, armhf, rpi, rpi2. Default linux kernel config does not currently include LZ4 for S/390 or PPC64le, so I did not change their config. XZ and ZLIB are in everything.
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