Add unstable-no-link feature #2317

Job	Run time
Check MSRV	1m 40s
Check formatting	15s
Lint macOS 64bit	1m 37s
Lint iOS 32bit	49s
Lint GNUStep + exceptions	1m 6s
Lint header-translator	42s
Lint test-assembly	32s
Test macOS 12	12m 12s
Assembly tests	0s
Check icrate features	0s
Verify header translator output	0s
${{ matrix.name }}	0s
Test Compiler-RT	0s
${{ matrix.name }}	0s
Test on iOS simulator w. dinghy	0s
Compiler UI	0s
	18m 53s

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