fix extra $PATH entry for OCaml to use opam/default rather than opam/system

[branfosj]

For OCaml/5.1.1-GCC-13.2.0 on generoso and for OCaml/4.14.0-GCC-11.3.0 on my system there is no opam/system but there is opam/default and this contains ocamlfind

[branfosj]

Test report by @branfosj

Overview of tested easyconfigs (in order)

• SUCCESS OCaml-4.14.0-GCC-11.3.0.eb

Build succeeded for 1 out of 1 (1 easyconfigs in total)
bear-pg0105u03a - Linux RHEL 8.6, x86_64, Intel(R) Xeon(R) Platinum 8360Y CPU @ 2.40GHz (icelake), Python 3.6.8
See https://gist.github.com/branfosj/9feae9561a08c50ad07a052e3d42079b for a full test report.

[bartoldeman]

LGTM

[boegel]

@branfosj Let's add "ocamlfind list" as sanity check command to catch this bug?

Maybe that should only be done conditionally though, when ocamlfind is being installed as extension?

[branfosj]

@branfosj Let's add "ocamlfind list" as sanity check command to catch this bug?

Maybe that should only be done conditionally though, when ocamlfind is being installed as extension?

Done in bc7fa88.

[boegel]

@boegelbot please test @ jsc-zen3
EB_ARGS="OCaml-4.14.0-GCC-11.3.0.eb OCaml-5.1.1-GCC-13.2.0.eb"

[boegel]

lgtm

[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=3390 EB_ARGS="OCaml-4.14.0-GCC-11.3.0.eb OCaml-5.1.1-GCC-13.2.0.eb" EB_REPO=easybuild-easyblocks EB_BRANCH=develop /opt/software/slurm/bin/sbatch --job-name test_PR_3390 --ntasks=8 ~/boegelbot/eb_from_pr_upload_jsc-zen3.sh' executed!

• exit code: 0
• output:

Submitted batch job 4672

Test results coming soon (I hope)...

- notification for comment with ID 2287170284 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 OCaml-4.14.0-GCC-11.3.0.eb
• SUCCESS OCaml-5.1.1-GCC-13.2.0.eb

Build succeeded for 2 out of 2 (2 easyconfigs in total)
jsczen3c2.int.jsc-zen3.fz-juelich.de - Linux Rocky Linux 9.4, x86_64, AMD EPYC-Milan Processor (zen3), Python 3.9.18
See https://gist.github.com/boegelbot/39d7551c0796de6ab8a6b2c6f0bdf8c7 for a full test report.