Configure XCTest for Dispatch if included in Foundation on Linux #2470
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What's in this pull request?
When libdispatch is added into the builds on Linux (for use by Foundation), there are subsequent build errors in XCTest as it needs access to build artefacts from libdispatch due to the downward dependency from Foundation. These changes pass the source and build locations through to XCTest if libdispatch is included in the builds.
The XCTest PR that picks up and uses the arguments has been merged already:
swiftlang/swift-corelibs-xctest#107
Resolved bug number: (SR-)
N/A
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