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Disable module decompression by default

nl6720 requested to merge nl6720/mkinitcpio:MODULES_DECOMPRESS-default-no into master

Now that all compressed files get moved to the early uncompressed CPIO, there is no need to recompress kernel modules and their firmware with a weaker compression. I.e. Arch's kernel modules and firmware are compressed with zstd at level 19, while mkinitcpio defaults to zstd's default level 3.

Having the kernel decompress modules and firmware upon loading them, instead of decompressing a larger initramfs image, also apparently improves boot speed on some slower CPUs.

This is a replacement for !344 (closed)

Edited by nl6720

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