[lldb][NativePDB] Require `target-windows` for MSVC test (#186578)

Fixes the failure on the lldb-remote-linux-win buildbot
(https://github.com/llvm/llvm-project/pull/186124#issuecomment-4060098881).

The test runs MSVC to produce an executable that only runs on Windows.

GitOrigin-RevId: 1f9b32ba061e7d5f7173a6a7150faf31964c2974
1 file changed