fix incompatible types errors when building the R extension dbarts on Arm

[bedroge]

See vdorie/dbarts#66. We've run into this with EESSI for versions R-bundle-CRAN-2023.12-foss-2023a.eb and R-4.2.2-foss-2022b.eb, but I've also applied the fix to the other R 4.2.x versions.

[boegel]

@boegelbot please test @ jsc-zen3
EB_ARGS="--installpath /tmp/$USER/pr20238"

[boegelbot]

@boegel: Request for testing this PR well received on jsczen3l1.int.jsc-zen3.fz-juelich.de

PR test command 'if [[ develop != 'develop' ]]; then EB_BRANCH=develop ./easybuild_develop.sh 2> /dev/null 1>&2; EB_PREFIX=/home/boegelbot/easybuild/develop source init_env_easybuild_develop.sh; fi; EB_PR=20238 EB_ARGS="--installpath /tmp/$USER/pr20238" EB_CONTAINER= EB_REPO=easybuild-easyconfigs EB_BRANCH=develop /opt/software/slurm/bin/sbatch --job-name test_PR_20238 --ntasks=8 ~/boegelbot/eb_from_pr_upload_jsc-zen3.sh' executed!

• exit code: 0
• output:

Submitted batch job 3875

Test results coming soon (I hope)...

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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).

[bedroge]

Build succeeded on Arm Neoverse v1: EESSI/software-layer#452 (comment)

[boegelbot]

Test report by @boegelbot
SUCCESS
Build succeeded for 4 out of 4 (4 easyconfigs in total)
jsczen3c1.int.jsc-zen3.fz-juelich.de - Linux Rocky Linux 9.3, x86_64, AMD EPYC-Milan Processor (zen3), Python 3.9.18
See https://gist.github.com/boegelbot/da536d8e90232614b7d361104f014610 for a full test report.

[boegel]

Going in, thanks @bedroge!

[migueldiascosta]

Test report by @migueldiascosta
SUCCESS
Build succeeded for 4 out of 4 (4 easyconfigs in total)
gracehopper - Linux Rocky Linux 9.3, AArch64, ARM UNKNOWN (neoverse_v2), 1 x NVIDIA NVIDIA GH200 480GB, 550.54.15, Python 3.9.18
See https://gist.github.com/migueldiascosta/2d0b51938c75f694f33ff1ed5d79ba54 for a full test report.