Only apply standard swift settings on valid targets #112

Job	Run time
Unit tests / Construct unit test matrix	3s
Soundness / API breakage check	52s
Integration test / Windows (6.0)	2s
Integration test / Windows (nightly-6.1)	2s
Integration test / Linux (5.9)	1m 42s
Integration test / Windows (nightly-main)	2s
Soundness / Broken symlinks check	5s
Integration test / Linux (5.10)	1m 45s
Soundness / Documentation check	1m 10s
Integration test / Linux (6.0)	2m 2s
Integration test / Linux (nightly-6.1)	2m 20s
Soundness / Format check	40s
Soundness / License headers check	4s
Integration test / Linux (nightly-main)	31s
Soundness / Python lint check	6s
Soundness / Shell check	35s
Soundness / Unacceptable language check	3s
Soundness / YAML lint check	3s
Unit tests / Unit tests / Linux (5.9)	40s
Unit tests / Unit tests / Linux (5.10)	40s
Unit tests / Unit tests / Linux (6.0)	53s
Unit tests / Unit tests / Linux (nightly-next)	58s
Unit tests / Unit tests / Linux (nightly-main)	56s
	16m 14s

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