[release/7.0.2xx] [dotnet] Add a missing IsMacEnabled check before executing a task in the _ComputeLinkerArguments target.

[vs-mobiletools-engineering-service2]

This fixes an issue where the build would fail on Windows if the Windows
machine wasn't connected to a remote Mac.

Fixes https://devdiv.visualstudio.com/DevDiv/_workitems/edit/1808448.

Backport of #18145

[vs-mobiletools-engineering-service2]

✅ API diff for current PR / commit

NET (empty diffs)

• iOS: (empty diff detected)
• tvOS: (empty diff detected)
• MacCatalyst: (empty diff detected)
• macOS: (empty diff detected)

✅ API diff vs stable

.NET (No breaking changes)

• iOS: vsdrops gist (No breaking changes)
• tvOS: (empty diff detected)
• MacCatalyst: vsdrops gist (No breaking changes)
• macOS: vsdrops gist (No breaking changes)
• Microsoft.iOS vs Microsoft.MacCatalyst: vsdrops (could not create gist: file 'D:\a\1\s\change-detection\results\stable-api-comparison\diff\dotnet\iOS-MacCatalyst-diff\Microsoft.iOS.Ref\ref\net7.0\Microsoft.iOS.MacCatalyst.md' does not exist)

✅ Generator diff

Generator diff is empty

Pipeline on Agent
Hash: a4f6f35ec08165099187a199403cf6ad89c382ba [PR build]

[vs-mobiletools-engineering-service2]

📚 [PR Build] Artifacts 📚

Packages generated

View packages

• Microsoft.iOS.Bundle.16.2.2064-ci.pr.gh18149.pkg
• Microsoft.iOS.Ref.16.2.2064-ci.pr.gh18149.nupkg
• Microsoft.iOS.Runtime.ios-arm.16.2.2064-ci.pr.gh18149.nupkg
• Microsoft.iOS.Runtime.ios-arm64.16.2.2064-ci.pr.gh18149.nupkg
• Microsoft.iOS.Runtime.iossimulator-arm64.16.2.2064-ci.pr.gh18149.nupkg
• Microsoft.iOS.Runtime.iossimulator-x64.16.2.2064-ci.pr.gh18149.nupkg
• Microsoft.iOS.Runtime.iossimulator-x86.16.2.2064-ci.pr.gh18149.nupkg
• Microsoft.iOS.Sdk.16.2.2064-ci.pr.gh18149.nupkg
• Microsoft.iOS.Templates.16.2.2064-ci.pr.gh18149.nupkg
• Microsoft.iOS.Windows.Sdk.16.2.2064-ci.pr.gh18149.nupkg
• Microsoft.MacCatalyst.Bundle.16.2.2064-ci.pr.gh18149.pkg
• Microsoft.MacCatalyst.Ref.16.2.2064-ci.pr.gh18149.nupkg
• Microsoft.MacCatalyst.Runtime.maccatalyst-arm64.16.2.2064-ci.pr.gh18149.nupkg
• Microsoft.MacCatalyst.Runtime.maccatalyst-x64.16.2.2064-ci.pr.gh18149.nupkg
• Microsoft.MacCatalyst.Sdk.16.2.2064-ci.pr.gh18149.nupkg
• Microsoft.MacCatalyst.Templates.16.2.2064-ci.pr.gh18149.nupkg
• Microsoft.macOS.Bundle.13.1.2064-ci.pr.gh18149.pkg
• Microsoft.macOS.Ref.13.1.2064-ci.pr.gh18149.nupkg
• Microsoft.macOS.Runtime.osx-arm64.13.1.2064-ci.pr.gh18149.nupkg
• Microsoft.macOS.Runtime.osx-x64.13.1.2064-ci.pr.gh18149.nupkg
• Microsoft.macOS.Sdk.13.1.2064-ci.pr.gh18149.nupkg
• Microsoft.macOS.Templates.13.1.2064-ci.pr.gh18149.nupkg
• Microsoft.NET.Sdk.iOS.Manifest-7.0.100.16.2.2064-ci.pr.gh18149.nupkg
• Microsoft.NET.Sdk.MacCatalyst.Manifest-7.0.100.16.2.2064-ci.pr.gh18149.nupkg
• Microsoft.NET.Sdk.macOS.Manifest-7.0.100.13.1.2064-ci.pr.gh18149.nupkg
• Microsoft.NET.Sdk.tvOS.Manifest-7.0.100.16.1.2561-ci.pr.gh18149.nupkg
• Microsoft.NET.Workload.iOS.16.2.2064-ci.pr.gh18149.msi
• Microsoft.tvOS.Bundle.16.1.2561-ci.pr.gh18149.pkg
• Microsoft.tvOS.Ref.16.1.2561-ci.pr.gh18149.nupkg
• Microsoft.tvOS.Runtime.tvos-arm64.16.1.2561-ci.pr.gh18149.nupkg
• Microsoft.tvOS.Runtime.tvossimulator-arm64.16.1.2561-ci.pr.gh18149.nupkg
• Microsoft.tvOS.Runtime.tvossimulator-x64.16.1.2561-ci.pr.gh18149.nupkg
• Microsoft.tvOS.Sdk.16.1.2561-ci.pr.gh18149.nupkg
• Microsoft.tvOS.Templates.16.1.2561-ci.pr.gh18149.nupkg
• xamarin.ios-16.1.1.434.pkg
• xamarin.mac-9.0.0.434.pkg

Pipeline on Agent XAMMINI-015.Ventura
Hash: a4f6f35ec08165099187a199403cf6ad89c382ba [PR build]

[vs-mobiletools-engineering-service2]

❌ [PR Build] Tests on macOS M1 - Mac Ventura (13.0) failed ❌

Failed tests are:

• monotouch-test

Pipeline on Agent
Hash: a4f6f35ec08165099187a199403cf6ad89c382ba [PR build]

[vs-mobiletools-engineering-service2]

❌ [PR Build] Tests on macOS M1 - Mac Big Sur (11.5) failed ❌

Failed tests are:

• monotouch-test

Pipeline on Agent
Hash: a4f6f35ec08165099187a199403cf6ad89c382ba [PR build]

[vs-mobiletools-engineering-service2]

🔥 [CI Build] Test results 🔥

Test results

❌ Tests failed on VSTS: simulator tests

0 tests crashed, 4 tests failed, 73 tests passed.

Failures

❌ monotouch tests

4 tests failed, 7 tests passed.

• monotouch-test/Mac [dotnet]/Debug [dotnet]: Failed (Test run failed.
  Tests run: 2665 Passed: 2575 Inconclusive: 9 Failed: 1 Ignored: 89)
• monotouch-test/Mac Catalyst [dotnet]/Debug [dotnet]: TimedOut (Execution timed out after 1200 seconds.
  Test run crashed)
• monotouch-test/iOS Unified 64-bits - simulator/Debug (static registrar) [dotnet]: Failed
• monotouch-test/tvOS - simulator/Debug [dotnet]: Failed

Html Report (VSDrops) Download

Successes

⚠️ bcl: No tests selected. Html Report (VSDrops) Download
✅ cecil: All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests: All 1 tests passed. Html Report (VSDrops) Download
✅ fsharp: All 4 tests passed. Html Report (VSDrops) Download
✅ framework: All 4 tests passed. Html Report (VSDrops) Download
✅ generator: All 1 tests passed. Html Report (VSDrops) Download
✅ interdependent_binding_projects: All 4 tests passed. Html Report (VSDrops) Download
⚠️ install_source: No tests selected. Html Report (VSDrops) Download
✅ introspection: All 4 tests passed. Html Report (VSDrops) Download
✅ linker: All 40 tests passed. Html Report (VSDrops) Download
⚠️ mac_binding_project: No tests selected. Html Report (VSDrops) Download
⚠️ mmp: No tests selected. Html Report (VSDrops) Download
⚠️ mononative: No tests selected. Html Report (VSDrops) Download
✅ msbuild: All 2 tests passed. Html Report (VSDrops) Download
⚠️ mtouch: No tests selected. Html Report (VSDrops) Download
⚠️ xammac: No tests selected. Html Report (VSDrops) Download
✅ xcframework: All 4 tests passed. Html Report (VSDrops) Download
✅ xtro: All 1 tests passed. Html Report (VSDrops) Download

Pipeline on Agent
Hash: [PR build]

[rolfbjarne]

Test failures are unrelated (https://github.com/xamarin/maccore/issues/2197, https://github.com/xamarin/maccore/issues/2668).