Enable testability if test discovery is enabled #2918
Merged
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This just makes XCBuild support match what we do in SwiftPM's own build
system here: https://github.com/apple/swift-package-manager/blob/master/Sources/XCBuildSupport/PIFBuilder.swift#L308
We should probably revisit this behaviour, because this seems like a
very confusing side effect on macOS where test discovery isn't even a
thing, but right now we just want to match what the builtin build system
does.
(cherry picked from commit 57f9d0d)