[clang] [Clang] Include the clang-shlib CMake project when building for MSVC (PR #109457)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-clang-aarch64-darwin` running on `doug-worker-4` while building `clang` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/190/builds/6283

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'LLVM-Unit :: Support/./SupportTests/4/11' FAILED ********************
Script(shard):
--
GTEST_OUTPUT=json:/Users/buildbot/buildbot-root/aarch64-darwin/build/unittests/Support/./SupportTests-LLVM-Unit-34136-4-11.json GTEST_SHUFFLE=0 GTEST_TOTAL_SHARDS=11 GTEST_SHARD_INDEX=4 /Users/buildbot/buildbot-root/aarch64-darwin/build/unittests/Support/./SupportTests
--

Script:
--
/Users/buildbot/buildbot-root/aarch64-darwin/build/unittests/Support/./SupportTests --gtest_filter=FileSystemTest.permissions
--
Test Directory: /tmp/lit-tmp-p2lue5kg/file-system-test-7c567e
/Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/unittests/Support/Path.cpp:2325: Failure
Value of: CheckPermissions(fs::set_gid_on_exe)
  Actual: false
Expected: true

/Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/unittests/Support/Path.cpp:2340: Failure
Value of: CheckPermissions(fs::set_uid_on_exe | fs::set_gid_on_exe | fs::sticky_bit)
  Actual: false
Expected: true

/Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/unittests/Support/Path.cpp:2347: Failure
Value of: CheckPermissions(fs::all_read | fs::set_uid_on_exe | fs::set_gid_on_exe | fs::sticky_bit)
  Actual: false
Expected: true

/Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/unittests/Support/Path.cpp:2350: Failure
Value of: CheckPermissions(fs::all_perms)
  Actual: false
Expected: true

/Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/unittests/Support/Path.cpp:2355: Failure
Value of: CheckPermissions(fs::all_perms & ~fs::sticky_bit)
  Actual: false
Expected: true


/Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/unittests/Support/Path.cpp:2325
Value of: CheckPermissions(fs::set_gid_on_exe)
  Actual: false
Expected: true

/Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/unittests/Support/Path.cpp:2340
Value of: CheckPermissions(fs::set_uid_on_exe | fs::set_gid_on_exe | fs::sticky_bit)
  Actual: false
Expected: true

/Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/unittests/Support/Path.cpp:2347
Value of: CheckPermissions(fs::all_read | fs::set_uid_on_exe | fs::set_gid_on_exe | fs::sticky_bit)
  Actual: false
...

```

</details>

https://github.com/llvm/llvm-project/pull/109457