Allow feat_os_unix on NetBSD (#11470)

* Allow `feat_os_unix` on NetBSD

Now that #11428 was merged, this should be fine.

However, CI will still fail.
See discussion on #5297 (comment)
for a potential fix.

Compiling `cross` from git will cost 1m 31s on a 2014 Intel® Core™ i5-4210U CPU @ 1.70GHz (4)

Author: 0323pin

.github/workflows/CICD.yml

@@ -5,7 +5,7 @@ name: CICD
 # spell-checker:ignore (jargon) SHAs deps dequote softprops subshell toolchain fuzzers dedupe devel profdata
 # spell-checker:ignore (people) Peltoche rivy dtolnay Anson dawidd
 # spell-checker:ignore (shell/tools) binutils choco clippy dmake esac fakeroot fdesc fdescfs gmake grcov halium lcov libclang libfuse libssl limactl nextest nocross pacman popd printf pushd redoxer rsync rustc rustfmt rustup shopt sccache utmpdump xargs zstd
-# spell-checker:ignore (misc) aarch alnum armhf bindir busytest coreutils defconfig DESTDIR gecos getenforce gnueabihf issuecomment maint manpages msys multisize noconfirm nofeatures nullglob onexitbegin onexitend pell runtest Swatinem tempfile testsuite toybox uutils libsystemd codspeed wasip
+# spell-checker:ignore (misc) aarch alnum armhf bindir busytest coreutils defconfig DESTDIR gecos getenforce gnueabihf issuecomment maint manpages msys multisize noconfirm nofeatures nullglob onexitbegin onexitend pell runtest Swatinem tempfile testsuite toybox uutils libsystemd codspeed wasip libexecinfo
 
 env:
   PROJECT_NAME: coreutils
@@ -378,7 +378,7 @@ jobs:
           - { os: ubuntu-latest  , target: x86_64-unknown-linux-gnu    , features: "feat_os_unix,test_risky_names", use-cross: use-cross, skip-publish: true }
           - { os: ubuntu-latest  , target: x86_64-unknown-linux-gnu    , features: "feat_os_unix,uudoc"   , use-cross: no, workspace-tests: true }
           - { os: ubuntu-latest  , target: x86_64-unknown-linux-musl   , features: feat_os_unix_musl , use-cross: use-cross }
-          - { os: ubuntu-latest  , target: x86_64-unknown-netbsd, features: "feat_Tier1,feat_require_unix_core,feat_require_unix_hostid,feat_require_unix_utmpx", use-cross: use-cross , skip-tests: true , check-only: true }
+          - { os: ubuntu-latest  , target: x86_64-unknown-netbsd, features: "feat_os_unix", use-cross: use-cross , skip-tests: true , check-only: true }
           - { os: ubuntu-latest  , target: x86_64-unknown-redox        , features: feat_os_unix_redox     , use-cross: redoxer , skip-tests: true , check-only: true }
           - { os: ubuntu-latest  , target: wasm32-wasip1, default-features: false, features: feat_wasm, skip-tests: true }
           - { os: macos-latest   , target: aarch64-apple-darwin        , features: feat_os_macos, workspace-tests: true } # M1 CPU
@@ -504,9 +504,20 @@ jobs:
             ;;
         esac
     - uses: taiki-e/install-action@v2
-      if: steps.vars.outputs.CARGO_CMD == 'cross'
+      # `cross` v0.2.5 lacks `libexecinfo` on NetBSD. However, this has been added in main.
+      # See https://github.com/cross-rs/cross/blob/main/docker/netbsd.sh
+      # We are pulling cross from a specific commit hash rather than HEAD to avoid any potential breakage that may be introduced.
+      # Once `cross` v0.3 is out, these conditionals can be removed.
+      if: steps.vars.outputs.CARGO_CMD == 'cross' && matrix.job.target != 'x86_64-unknown-netbsd'
       with:
         tool: cross@0.2.5
+    - uses: dtolnay/rust-toolchain@master
+      if: steps.vars.outputs.CARGO_CMD == 'cross' && matrix.job.target == 'x86_64-unknown-netbsd'
+      with:
+        toolchain: "1.92.0"
+    - name: Install cross from git (NetBSD)
+      if: steps.vars.outputs.CARGO_CMD == 'cross' && matrix.job.target == 'x86_64-unknown-netbsd'
+      run: cargo +1.92.0 install cross --git https://github.com/cross-rs/cross --rev 588b3c99db52b5a9c5906fab96cfadcf1bde7863
     - name: Create all needed build/work directories
       shell: bash
       run: |
@@ -603,7 +614,7 @@ jobs:
       if: matrix.job.skip-publish != true && matrix.job.check-only == true
       run: |
         # expr breaks redox
-        sed -i.b '/"expr",/d' Cargo.toml
+        if [[ "${{ matrix.job.target }}" == *"redox"* ]]; then sed -i.b '/"expr",/d' Cargo.toml; fi
         ${{ steps.vars.outputs.CARGO_CMD }} ${{ steps.vars.outputs.CARGO_CMD_OPTIONS }} check \
         --target=${{ matrix.job.target }} ${{ matrix.job.cargo-options }} ${{ steps.vars.outputs.CARGO_FEATURES_OPTION }} ${{ steps.vars.outputs.CARGO_DEFAULT_FEATURES_OPTION }}
     - name: Test