[cmake][lldb] Fix header search path in unified builds #5321
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After swiftlang/swift#60218 was merged, unified builds with CMake fail because the headers that used to be relative are not found in the header search path.
Normal Swift builds rely on the else branch below these changes and use SWIFT_INCLUDE_DIRS, which was correctly updated in the PR linked above, but for the less used unified builds one has to be explicit about which header search path is needed.
/cc @egorzhdan @zoecarver @etcwilde @compnerd