Add support for WASILibc #251

Job	Run time
Integration Tests / Linux (5.8)	12m 57s
Integration Tests / Linux (5.9)	13m 4s
Integration Tests / Linux (5.10)	13m 5s
Integration Tests / Linux (nightly-6.0)	13m 7s
Integration Tests / Linux (nightly-main)	13m 6s
Soundness / API breakage check	2m 31s
Soundness / Documentation check	2m 6s
Soundness / Broken symlinks check	5s
Soundness / Format check	57s
Soundness / License headers check	8s
Soundness / Shell check	8s
Soundness / Unacceptable language check	9s
Swift 6 Language Mode / Swift 6 language mode	1m 2s
Cxx interop / Cxx interop / Linux (5.8)	1m 4s
Cxx interop / Cxx interop / Linux (5.9)	1m 16s
Cxx interop / Cxx interop / Linux (5.10)	1m 6s
Cxx interop / Cxx interop / Linux (nightly-6.0)	1m 36s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 38s
Unit tests / Unit tests / Linux (5.8)	3m 14s
Unit tests / Unit tests / Linux (5.9)	3m 25s
Unit tests / Unit tests / Linux (5.10)	3m 27s
Unit tests / Unit tests / Linux (nightly-6.0)	4m 38s
Unit tests / Unit tests / Linux (nightly-main)	4m 24s
Benchmarks / Benchmarks / Linux (5.8)	2m 40s
Benchmarks / Benchmarks / Linux (5.9)	3m 44s
Benchmarks / Benchmarks / Linux (5.10)	3m 35s
Benchmarks / Benchmarks / Linux (nightly-6.0)	4m 33s
Benchmarks / Benchmarks / Linux (nightly-main)	4m 35s
	1h 57m 20s

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