Add support for WASILibc #269

Job	Run time
Integration Tests / Linux (5.8)	10m 42s
Integration Tests / Linux (5.9)	10m 41s
Integration Tests / Linux (5.10)	10m 41s
Integration Tests / Linux (nightly-6.0)	10m 42s
Integration Tests / Linux (nightly-main)	10m 42s
Soundness / API breakage check	2m 33s
Soundness / Documentation check	2m 11s
Soundness / Broken symlinks check	4s
Soundness / License headers check	11s
Soundness / Unacceptable language check	3s
Soundness / Format check	1m 4s
Soundness / Shell check	6s
Swift 6 Language Mode / Swift 6 language mode	1m 2s
Cxx interop / Cxx interop / Linux (5.8)	1m 0s
Cxx interop / Cxx interop / Linux (5.9)	1m 17s
Cxx interop / Cxx interop / Linux (5.10)	1m 21s
Cxx interop / Cxx interop / Linux (nightly-6.0)	1m 47s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 46s
Unit tests / Unit tests / Linux (5.8)	2m 28s
Unit tests / Unit tests / Linux (5.9)	2m 54s
Unit tests / Unit tests / Linux (5.10)	2m 19s
Benchmarks / Benchmarks / Linux (5.8)	2m 33s
Unit tests / Unit tests / Linux (nightly-6.0)	3m 55s
Benchmarks / Benchmarks / Linux (5.9)	3m 42s
Unit tests / Unit tests / Linux (nightly-main)	3m 55s
Benchmarks / Benchmarks / Linux (5.10)	3m 44s
Benchmarks / Benchmarks / Linux (nightly-6.0)	5m 37s
Benchmarks / Benchmarks / Linux (nightly-main)	4m 47s
	1h 43m 47s

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