Remove icrate's custom macros #2598

Job	Run time
Check formatting	9s
Check MSRV	1m 16s
Lint macOS 64bit	2m 33s
Lint iOS 32bit	57s
Lint GNUStep + exceptions	1m 25s
Lint header-translator	30s
Lint test-assembly	27s
Test macOS 12	5m 12s
Assembly tests	51s
Verify header translator output	16s
Compiler UI	1m 46s
Test GNUStep with libobjc2 v1.9	1m 20s
Test GNUStep with libobjc2 v2.0	1m 21s
Check icrate features	0s
Test GNUStep with libobjc2 v2.1 on nightly	1m 41s
${{ matrix.name }}	0s
Test GNUStep 32bit	1m 24s
Test Compiler-RT	29s
Test on iOS simulator w. dinghy	0s
	21m 37s

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