Only apply standard swift settings on valid targets #99

Job	Run time
Cxx interop / Construct Cxx interop matrix	2s
Unit tests / Construct unit test matrix	3s
Soundness / API breakage check	4m 25s
Soundness / Documentation check	2m 53s
Soundness / Unacceptable language check	3s
Soundness / License headers check	3s
Soundness / Broken symlinks check	2s
Soundness / Format check	35s
Soundness / Shell check	35s
Soundness / YAML lint check	2s
Soundness / Python lint check	3s
Cxx interop / Cxx interop / Linux (5.9)	2m 26s
Cxx interop / Cxx interop / Linux (5.10)	2m 17s
Cxx interop / Cxx interop / Linux (6.0)	2m 34s
Cxx interop / Cxx interop / Linux (nightly-next)	3m 19s
Cxx interop / Cxx interop / Linux (nightly-main)	3m 14s
Unit tests / Unit tests / Linux (5.9)	4m 33s
Unit tests / Unit tests / Linux (5.10)	4m 29s
Unit tests / Unit tests / Linux (6.0)	5m 2s
Unit tests / Unit tests / Linux (nightly-next)	5m 37s
Unit tests / Unit tests / Linux (nightly-main)	5m 29s
	47m 46s

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