disable LLVM build downloads from CI in Rust

[lexming]

   Compiling test v0.0.0 (/dev/shm/eb-submit-build/Rust/1.70.0/GCCcore-12.3.0/rustc-1.70.0-src/library/test)
    Finished release [optimized] target(s) in 22.69s
downloading https://ci-artifacts.rust-lang.org/rustc-builds/90c541806f23a127002de5b4038be731ba1458ca/rust-dev-1.70.0-x86_64-unknown-linux-gnu.tar.xz
#=#=#                                                                         ^M##O#-#                                                                        ^M##O=#  #
                                                           ^Mcurl: (22) The requested URL returned error: 404

error: failed to download llvm from ci

    help: old builds get deleted after a certain time
    help: if trying to compile an old commit of rustc, disable `download-ci-llvm` in config.toml:

    [llvm]
    download-ci-llvm = false

Build completed unsuccessfully in 0:05:18

[lexming]

@boegelbot please test @ jsc-zen2
EB_ARGS="Rust-1.70.0-GCCcore-12.3.0.eb"

[boegelbot]

@lexming: Request for testing this PR well received on jsczen2l1.int.jsc-zen2.easybuild-test.cluster

PR test command 'EB_PR=3038 EB_ARGS="Rust-1.70.0-GCCcore-12.3.0.eb" EB_REPO=easybuild-easyblocks /opt/software/slurm/bin/sbatch --mem-per-cpu=4000M --job-name test_PR_3038 --ntasks=8 ~/boegelbot/eb_from_pr_upload_jsc-zen2.sh' executed!

• exit code: 0
• output:

Submitted batch job 3782

Test results coming soon (I hope)...

- notification for comment with ID 1824458174 processed

Message to humans: this is just bookkeeping information for me,
it is of no use to you (unless you think I have a bug, which I don't).

[boegelbot]

Test report by @boegelbot

Overview of tested easyconfigs (in order)

• SUCCESS Rust-1.70.0-GCCcore-12.3.0.eb

Build succeeded for 1 out of 1 (1 easyconfigs in total)
jsczen2c1.int.jsc-zen2.easybuild-test.cluster - Linux Rocky Linux 8.5, x86_64, AMD EPYC 7742 64-Core Processor (zen2), Python 3.6.8
See https://gist.github.com/boegelbot/54aff6470c3012367c8731cc6cbd2414 for a full test report.

[lexming]

@boegelbot please test @ jsc-zen2
EB_ARGS="Rust-1.60.0-GCCcore-11.3.0.eb"

[boegelbot]

@lexming: Request for testing this PR well received on jsczen2l1.int.jsc-zen2.easybuild-test.cluster

PR test command 'EB_PR=3038 EB_ARGS="Rust-1.60.0-GCCcore-11.3.0.eb" EB_REPO=easybuild-easyblocks /opt/software/slurm/bin/sbatch --mem-per-cpu=4000M --job-name test_PR_3038 --ntasks=8 ~/boegelbot/eb_from_pr_upload_jsc-zen2.sh' executed!

• exit code: 0
• output:

Submitted batch job 3783

Test results coming soon (I hope)...

- notification for comment with ID 1824599000 processed

Message to humans: this is just bookkeeping information for me,
it is of no use to you (unless you think I have a bug, which I don't).

[boegelbot]

Test report by @boegelbot

Overview of tested easyconfigs (in order)

• SUCCESS Rust-1.60.0-GCCcore-11.3.0.eb

Build succeeded for 1 out of 1 (1 easyconfigs in total)
jsczen2c1.int.jsc-zen2.easybuild-test.cluster - Linux Rocky Linux 8.5, x86_64, AMD EPYC 7742 64-Core Processor (zen2), Python 3.6.8
See https://gist.github.com/boegelbot/3ff90cc7a9a9334c8d4cc5a2a044d50b for a full test report.

[boegel]

Extensive test report with 8 Rust rebuilds coming up...

[boegel]

Test report by @boegel

Overview of tested easyconfigs (in order)

• SUCCESS Rust-1.52.1-GCCcore-10.3.0.eb
• SUCCESS Rust-1.54.0-GCCcore-11.2.0.eb
• SUCCESS Rust-1.56.0-GCCcore-11.2.0.eb
• SUCCESS Rust-1.60.0-GCCcore-10.3.0.eb
• SUCCESS Rust-1.60.0-GCCcore-11.3.0.eb
• SUCCESS Rust-1.65.0-GCCcore-12.2.0.eb
• SUCCESS Rust-1.70.0-GCCcore-12.3.0.eb
• SUCCESS Rust-1.73.0-GCCcore-13.2.0.eb

Build succeeded for 8 out of 8 (8 easyconfigs in total)
node3144.skitty.os - Linux RHEL 8.8, x86_64, Intel(R) Xeon(R) Gold 6140 CPU @ 2.30GHz (skylake_avx512), Python 3.6.8
See https://gist.github.com/boegel/efe1001a5cbb95ac86c865ce8e9aa182 for a full test report.

[boegel]

lgtm

[boegel]

Test report by @boegel

Overview of tested easyconfigs (in order)

• SUCCESS Rust-1.52.1-GCCcore-10.2.0.eb

Build succeeded for 1 out of 1 (1 easyconfigs in total)
node3144.skitty.os - Linux RHEL 8.8, x86_64, Intel(R) Xeon(R) Gold 6140 CPU @ 2.30GHz (skylake_avx512), Python 3.6.8
See https://gist.github.com/boegel/f656f5d9e4f16170210ffda34369b033 for a full test report.