Pass -sdk to Windows in LLDB tests #11717
                
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Currently all LLDB tests that run
swiftare disabled or xfailed on Windows. swiftlang/swift#85178 helps, but without explicitly passing-sdk, we look forswiftrt.objin the wrong place.This is the expedient version. It's documented that setting
SDKROOTmakes-sdkdefault to the value ofSDKROOT, but in this case we explicitly check the option value instead of using the derivedOutputInfo.SDKPath. If we fix that, we don't have to pass it explicitly here at the cost of threadingSDKPaththrough a bunch of places (see swiftlang/swift#85202)