[Cleanup] Remove old torrents

[ColorfulRhino]

Description

This PR is part of the big repo cleanup ✨

I tried to find references for the old toolchains. The only reference I could find that was actively using an external toolchain in meson-s4t7. There I have bumped the compiler from 7.3.1 to 7.4.1. A 2019 compiler seems like a good fit to compile a 2019 u-boot :) @viraniac

Other than that, I found only this:

build/lib/functions/host/external-toolchains.sh

Lines 26 to 37 in 560993a

	local toolchains=(
	"gcc-linaro-aarch64-none-elf-4.8-2013.11_linux.tar.xz"
	"gcc-linaro-arm-none-eabi-4.8-2014.04_linux.tar.xz"
	"gcc-linaro-arm-linux-gnueabihf-4.8-2014.04_linux.tar.xz"
	"gcc-linaro-7.4.1-2019.02-x86_64_arm-linux-gnueabi.tar.xz"
	"gcc-linaro-7.4.1-2019.02-x86_64_aarch64-linux-gnu.tar.xz"
	"gcc-arm-8.3-2019.03-x86_64-arm-linux-gnueabihf.tar.xz"
	"gcc-arm-8.3-2019.03-x86_64-aarch64-linux-gnu.tar.xz"
	"gcc-arm-9.2-2019.12-x86_64-arm-none-linux-gnueabihf.tar.xz"
	"gcc-arm-9.2-2019.12-x86_64-aarch64-none-linux-gnu.tar.xz"
	"gcc-arm-11.2-2022.02-x86_64-arm-none-linux-gnueabihf.tar.xz"
	"gcc-arm-11.2-2022.02-x86_64-aarch64-none-linux-gnu.tar.xz"

I have kept every torrent that is referenced in that list, apart from the first few ones which are 10+ years old now and would probably not really work well on a modern machine anyway.

Please let me know if you know that a certain compiler/torrent is still needed.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings

[igorpecovnik]

I am ok with torrents, but for changes on khadas legacy compilers is up to @viraniac

[ColorfulRhino]

I am ok with torrents, but for changes on khadas legacy compilers is up to @viraniac

Yes, I have requested a review from him 👍

[viraniac]

I don't see gcc-linaro-7.4.1-2019.02-aarch64_aarch64-elf.tar.xz file on dl.armbian.com. Unless you are uploading that as well, I will suggest to leave it alone.

[ColorfulRhino]

I don't see gcc-linaro-7.4.1-2019.02-aarch64_aarch64-elf.tar.xz file on dl.armbian.com. Unless you are uploading that as well, I will suggest to leave it alone.

I was confused since I explicitely checked. But turns out the "elf" part is the detail that's different from all the other files. I only checked 7.4.1 - yup, aarch64 - yup. Sorry! This is what reviews are for, thanks for catching it 👍

[viraniac]

Current changes looks good to me. We can remove download_external_toolchains function, but that can also be done in seperate PR

[ColorfulRhino]

Alright thanks! I'll see if I can remove the whole code path for SKIP_EXTERNAL_TOOLCHAINS in a separate PR 👍
Not sure if the torrents serve any other purpose than for the external toolchains or if they can also be removed in the same step.

[igorpecovnik]

Not sure if the torrents serve any other purpose than for the external toolchains or if they can also be removed in the same step.

IIRC we used to have this for rootfs caching, but this is also deprecated after it was moved to OCI.