enable system pybind11 for PyTorch 1.10+ to make sure pybind11 provided as dependency is used

[Flamefire]

(created using eb --new-pr)

PyTorch switched to custom pybind11 by default in 1.10: pytorch/pytorch@7179e7e

But we provide our Pybind11, which was used before and IMO should still be used.

• Requires fix type check for optarch value in Cargo easyblock #2969 due to unrelated CI failure

[migueldiascosta]

sounds good to me

[Flamefire]

I'm currently running some builds to verify this doesn't break anything. Will mark this as ready once they succeeded.

[Flamefire]

Test report by @Flamefire

Overview of tested easyconfigs (in order)

• SUCCESS PyTorch-1.10.0-foss-2021a.eb
• SUCCESS PyTorch-1.12.1-foss-2021a.eb
• SUCCESS PyTorch-1.12.1-foss-2021b.eb
• SUCCESS PyTorch-1.12.1-foss-2022a.eb

Build succeeded for 4 out of 4 (4 easyconfigs in total)
taurusi8022 - Linux CentOS Linux 7.9.2009, x86_64, AMD EPYC 7352 24-Core Processor (zen2), 8 x NVIDIA NVIDIA A100-SXM4-40GB, 470.57.02, Python 2.7.5
See https://gist.github.com/Flamefire/6004c092ef23c0c27b73f105094c822d for a full test report.

[Flamefire]

Test report by @Flamefire

Overview of tested easyconfigs (in order)

• SUCCESS PyTorch-1.10.0-foss-2021a.eb
• SUCCESS PyTorch-1.12.1-foss-2021a.eb
• SUCCESS PyTorch-1.12.1-foss-2021b.eb
• SUCCESS PyTorch-1.12.1-foss-2022a.eb

Build succeeded for 4 out of 4 (4 easyconfigs in total)
taurusml5 - Linux RHEL 7.6, POWER, 8335-GTX (power9le), 6 x NVIDIA Tesla V100-SXM2-32GB, 440.64.00, Python 2.7.5
See https://gist.github.com/Flamefire/13c515ec243ffcf987975e56b832d054 for a full test report.

[Flamefire]

I tested 4 ECs with and without this PR on 2 architectures. Seems to work just fine, so I'd say this is good to go!

[migueldiascosta]

lgtm

[migueldiascosta]

Going in, thanks @Flamefire!