Fix duplicate SCStreamErrorDomain #3461

Job	Run time
Check MSRV	1m 9s
Lint macOS x86_64	4m 40s
Check formatting	17s
Lint iOS ARMv7s	4m 47s
Lint visionOS Aarch64 simulator	4m 39s
Lint GNUStep + exceptions	1m 54s
Lint header-translator	41s
Lint test-assembly	30s
Test macOS 15 Aarch64	3m 1s
Assembly tests	1m 0s
Verify header translator output	4m 52s
Check framework features	0s
${{ ((matrix.test && 'Test') \|\| 'Build') }} ${{ matrix.name }}	0s
Test Compiler-RT	44s
Test GNUStep with libobjc2 v1.9	1m 19s
Test GNUStep with libobjc2 v2.0	1m 33s
Compiler UI	46s
Test GNUStep with libobjc2 v2.1 on nightly	1m 8s
Test on iOS simulator w. dinghy	0s
Test GNUStep 32bit	1m 38s
	34m 38s

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