Only apply standard swift settings on valid targets #98

Job	Run time
Cxx interop / Construct Cxx interop matrix	2s
Unit tests / Construct unit test matrix	2s
Soundness / API breakage check	55s
Soundness / Documentation check	56s
Soundness / Broken symlinks check	2s
Soundness / Python lint check	6s
Soundness / Format check	33s
Soundness / License headers check	4s
Soundness / Shell check	31s
Soundness / Unacceptable language check	3s
Soundness / YAML lint check	3s
Cxx interop / Cxx interop / Linux (5.9)	1m 8s
Cxx interop / Cxx interop / Linux (5.10)	1m 6s
Cxx interop / Cxx interop / Linux (6.0)	1m 8s
Cxx interop / Cxx interop / Linux (nightly-next)	1m 7s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 8s
Unit tests / Unit tests / Linux (5.9)	1m 8s
Unit tests / Unit tests / Linux (5.10)	1m 7s
Unit tests / Unit tests / Linux (6.0)	1m 7s
Unit tests / Unit tests / Linux (nightly-next)	1m 6s
Unit tests / Unit tests / Linux (nightly-main)	1m 9s
	14m 31s

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