Fix protocol names #2221

Job	Run time
Check formatting	8s
Lint macOS 64bit	4m 7s
Lint iOS 32bit	1m 48s
Lint GNUStep + exceptions	1m 43s
Lint header-translator	37s
Lint test-assembly	36s
Check MSRV	1m 32s
Test macOS 12	5m 3s
Compiler UI	1m 46s
Verify header translator output	58s
Assembly tests	1m 6s
Check icrate features	0s
Test GNUStep with libobjc2 v1.9	1m 38s
Test GNUStep with libobjc2 v2.0	1m 57s
Test GNUStep with libobjc2 v2.1 on nightly	1m 56s
Test GNUStep 32bit	1m 55s
${{ matrix.name }}	0s
Test Compiler-RT	23s
Test on iOS simulator w. dinghy	0s
	27m 13s

Provide feedback