update README.md to reflect current build from source status on master

[mikebrow]

Signed-off-by: Mike Brown [email protected]

To avoid new contributor issues when building master a couple README.md comments will help... This change:

• Documents the current support restriction to apt package g++-9 #91328 ** noting here that with the commit in https://github.com/pytorch/pytorch/pull/92911 g++-11.3 appears to build and run local tests at least as well as g++9, so this restriction may be overcome with that PR merge depending on success and CI updates.

• Documents wip status for CUDA 12 #91122

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/92729

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As of commit ae8a1ed19bdef011a7018ed574c321f98b6f5e0e: :green_heart: Looks good so far! There are no failures yet. :green_heart:

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[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: mikebrow / name: Mike Brown (ae8a1ed19bdef011a7018ed574c321f98b6f5e0e)

[kit1980]

@pytorchbot rebase

[pytorchmergebot]

@pytorchbot started a rebase job onto refs/remotes/origin/viable/strict. Check the current status here

[pytorchmergebot]

Successfully rebased update-README-gcc-cuda-max-values onto refs/remotes/origin/viable/strict, please pull locally before adding more changes (for example, via git checkout update-README-gcc-cuda-max-values && git pull --rebase)

[kit1980]

@pytorchbot merge

[pytorchmergebot]

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