[core] Remove platform dance in Package.swift #319

Job	Run time
musl	1m 29s
Soundness / Documentation check	1m 29s
Soundness / API breakage check	1m 43s
Soundness / Broken symlinks check	3s
Soundness / Format check	40s
Soundness / License headers check	3s
Soundness / Shell check	0s
Soundness / Unacceptable language check	2s
Soundness / YAML lint check	4s
Integration Tests / Test archive plugin	2m 23s
Integration Tests / Test Examples/APIGateway on 6.0.1-amazonlinux2	1m 22s
Soundness / Python lint check	0s
Integration Tests / Test Examples/BackgroundTasks on 6.0.1-amazonlinux2	1m 15s
Swift 6 Language Mode / Swift 6 language mode	1m 16s
Integration Tests / Test Examples/HelloJSON on 6.0.1-amazonlinux2	1m 18s
Integration Tests / Test Examples/HelloWorld on 6.0.1-amazonlinux2	1m 18s
Integration Tests / Test Examples/S3_AWSSDK on 6.0.1-amazonlinux2	4m 13s
Integration Tests / Test Examples/S3_Soto on 6.0.1-amazonlinux2	4m 32s
Integration Tests / Test Examples/Streaming on 6.0.1-amazonlinux2	1m 17s
Unit tests / Unit tests / Linux (5.9)	26s
Unit tests / Unit tests / Windows (6.0)	3s
Unit tests / Unit tests / Linux (5.10)	26s
Unit tests / Unit tests / Linux (6.0)	1m 27s
Unit tests / Unit tests / Windows (nightly-6.0)	2s
Unit tests / Unit tests / Linux (nightly-6.0)	1m 51s
Unit tests / Unit tests / Windows (nightly-main)	2s
Unit tests / Unit tests / Linux (nightly-main)	1m 39s
	30m 23s

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