Don't build IJW and COM host tests for mono

[elinor-fung]

I missed that we had this condition for ijwhost and comhost, which is why the added ijw test fails to build.

runtime/src/native/corehost/CMakeLists.txt

Lines 35 to 40 in 4e75015

	if (NOT RUNTIME_FLAVOR STREQUAL Mono)
	if(CLR_CMAKE_TARGET_WIN32)
	add_subdirectory(comhost)
	add_subdirectory(ijwhost)
	endif()
	endif()

Fixes #66380

[dotnet-issue-labeler]

I couldn't figure out the best area label to add to this PR. If you have write-permissions please help me learn by adding exactly one area label.

[elinor-fung]

/azp run runtime-extra-platforms

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[vitek-karas]

Side note/question: why are we building the native hosting tests and mock for mono? Do we actually run them with a mono based framework (as in testhost produces a working mono based dotnet install?)

[elinor-fung]

Yeah, I was wondering that too (didn't look into it for the purposes of just getting this fix). I think the answer is that we don't need to and can just exclude everything in corehost/test - will check on that after this.

[steveisok]

Side note/question: why are we building the native hosting tests and mock for mono? Do we actually run them with a mono based framework (as in testhost produces a working mono based dotnet install?)

There are community based configurations that only have mono as the runtime (s390x, for example). I think we still need this.

[elinor-fung]

The configurations actually run the installer/host tests? I know we need the host product itself, but for tests, I'm pretty sure a number of them aren't supported for mono (COM, startup hooks) and I don't think the tests do anything to exclude themselves from being run on mono.

[steveisok]

The configurations actually run the installer/host tests?

I took a closer look and I don't think we run the installer/host tests.

[elinor-fung]

Windows x64 Mono leg passed. Other extra-platforms failures are unrelated.

Faliures in runtime pipeline are:

• ReadToEndAsync_WithCancellation: ReadToEndAsync_WithCancellation test failing due to lack of free space #66395
• System.Text.Json.Tests timeout: Timeout running System.Text.Json.Serialization.Tests.CustomConverterTests.GetConverter_Poco_WriteThrowsNotSupportedException on mono interpreter #66371