[QNX7.1] `std::fs::tests::symlink_hard_link` broken on main about rust HOT 3 OPEN

@japaric thanks for the report! I will need to re-test it for QNX 7.0, to see if it is a 7.0 requirement (i don't recall why this was required initially, but clearly I ran into some issues with it). I also plan to do a similar automation to ensure 7.0 builds run without problems on our hardware. Is there a list of tests you see failing on 7.1 that are OK to ignore? I see a list here - is this the most relevant one? Thx!

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we do not ignore any single unit test at the moment and we run library (e.g. libstd) tests as well as (cross) compilation tests using TEST_DEVICE_ADDR. we don't pass --exclude to x.py but instead pass the list of test suites as arguments.

we currently run these test suites:

$ # run these from the root of the ferrocene/ferrocene repo

$ ferrocene/ci/split-tasks.py test:library
library/alloc library/core library/test

$ ferrocene/ci/split-tasks.py test:library-std
library/std

$ ferrocene/ci/split-tasks.py qnx:compiletest-no-only-hosts
tests/assembly tests/codegen tests/codegen-units tests/coverage tests/crashes tests/debuginfo tests/incremental tests/mir-opt tests/run-make tests/run-pass-valgrind tests/ui

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WG-prioritization assigning priority (Zulip discussion).

@rustbot label -I-prioritize +P-low

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