Tests: adjust LLBuildManifestTests expectations for Windows (#5477)
Tests: adjust LLBuildManifestTests expectations for Windows (#5477)

This adjusts the expectations to allow Windows to be supported as well
with the use of the paths more thoroughly.  This identified an issue in
the path handling in the manifest generation (tracked as #5475).
apple/swift-package-manager,abertelrud/swift-package-manager,abertelrud/swift-package-manager,apple/swift-package-manager,apple/swift-package-manager,abertelrud/swift-package-manager,apple/swift-package-manager,abertelrud/swift-package-manager,abertelrud/swift-package-manager,apple/swift-package-manager