Xcode Swift package lowering ignores SwiftPM-resolved system library paths

Summary

Once 0.50.0 fails to lower Swift package system-library targets when SwiftPM resolves the target outside the conventional Sources/<target> directory.

Public reproduction

Use an Xcode project that consumes awslabs/aws-crt-swift release v0.52.1.

Its manifest declares:

.systemLibrary(name: "LibNative")

The package contains:

Source/LibNative/module.modulemap

swift package dump-package reports the target as type system but omits its resolved path. Once consequently assumes Sources/LibNative and fails with (notice the “s” in Sources/):

Swift package system target `aws-crt-swift/LibNative` has no module.modulemap

SwiftPM reports the correct path through:

swift package \
  --package-path <package-path> \
  --disable-automatic-resolution \
  describe \
  --type json

which resolves LibNative to Source/LibNative (no “s” in Source/).

Expected behavior

Once should use SwiftPM-resolved target paths when dump-package omits them, rather than assuming Sources/<target>.

This should apply generically to Swift package targets and should not contain package-specific path handling.

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