Only apply standard swift settings on valid targets #23

Job	Run time
Cxx interop / Construct Cxx interop matrix	2s
Unit tests / Construct unit test matrix	2s
Soundness / API breakage check	4m 29s
Soundness / Broken symlinks check	4s
Soundness / Documentation check	3m 8s
Soundness / License headers check	4s
Soundness / Unacceptable language check	3s
Soundness / Format check	31s
Soundness / Python lint check	5s
Soundness / Shell check	30s
Soundness / YAML lint check	5s
Cxx interop / Swift 6 language mode	2m 38s
Cxx interop / Cxx interop / Linux (5.9)	2m 34s
Cxx interop / Cxx interop / Linux (5.10)	2m 25s
Cxx interop / Cxx interop / Linux (6.0)	2m 46s
Cxx interop / Cxx interop / Linux (nightly-next)	3m 34s
Cxx interop / Cxx interop / Linux (nightly-main)	3m 31s
Unit tests / Unit tests / Linux (5.9)	2m 29s
Unit tests / Unit tests / Linux (5.10)	2m 18s
Unit tests / Unit tests / Linux (6.0)	2m 58s
Unit tests / Unit tests / Linux (nightly-next)	3m 14s
Unit tests / Unit tests / Linux (nightly-main)	3m 16s
	40m 46s

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