Fix doubly nested CF pointers #3286

Job	Run time
Check formatting	10s
Check MSRV	53s
Lint macOS x86_64	3m 19s
Lint iOS ARMv7s	3m 23s
Lint visionOS Aarch64 simulator	3m 19s
Lint GNUStep + exceptions	1m 22s
Lint header-translator	40s
Lint test-assembly	27s
Test macOS 15 Aarch64	1m 37s
Assembly tests	52s
Verify header translator output	1m 51s
${{ ((matrix.test && 'Test') \|\| 'Build') }} ${{ matrix.name }}	0s
Check framework features	0s
Test Compiler-RT	36s
Test GNUStep with libobjc2 v1.9	1m 1s
Test on iOS simulator w. dinghy	0s
Compiler UI	47s
Test GNUStep with libobjc2 v2.0	1m 29s
Test GNUStep with libobjc2 v2.1 on nightly	1m 1s
Test GNUStep 32bit	1m 12s
	23m 59s

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