Don't -fobjc-runtime=gnustep-2.0 as a global flag #197

Job	Run time
ubuntu-22.04 Release LLVM-13 libc++	50s
Cross-build for arm-linux-gnueabihf LLVM-13 Release	59s
windows-2022 Release x64_x86	1m 8s
Cross-build for aarch64-linux-gnu LLVM-13 Release	58s
ubuntu-22.04 Release LLVM-14 libc++	33s
windows-2022 Release x64	1m 45s
windows-2022 Debug x64_x86	1m 26s
ubuntu-22.04 Release LLVM-15 libc++	1m 0s
Cross-build for arm-linux-gnueabihf LLVM-14 Release	1m 8s
windows-2022 Debug x64	2m 9s
ubuntu-22.04 Release LLVM-13 libstdc++	34s
windows-2019 Release x64_x86	1m 52s
Cross-build for aarch64-linux-gnu LLVM-14 Release	1m 12s
ubuntu-22.04 Release LLVM-14 libstdc++	44s
windows-2019 Release x64	2m 28s
ubuntu-22.04 Release LLVM-15 libstdc++	29s
Cross-build for arm-linux-gnueabihf LLVM-13 Debug	2m 13s
windows-2019 Debug x64_x86	2m 18s
ubuntu-22.04 Debug LLVM-13 libc++	45s
Cross-build for aarch64-linux-gnu LLVM-13 Debug	1m 53s
windows-2019 Debug x64	2m 15s
ubuntu-22.04 Debug LLVM-14 libc++	2m 31s
Cross-build for arm-linux-gnueabihf LLVM-14 Debug	2m 17s
ubuntu-22.04 Debug LLVM-15 libc++	35s
Cross-build for aarch64-linux-gnu LLVM-14 Debug	1m 44s
ubuntu-22.04 Debug LLVM-13 libstdc++	57s
ubuntu-22.04 Debug LLVM-14 libstdc++	48s
ubuntu-22.04 Debug LLVM-15 libstdc++	46s
ubuntu-20.04 Release LLVM-10 libc++	46s
ubuntu-20.04 Release LLVM-12 libc++	40s
ubuntu-20.04 Release LLVM-10 libstdc++	42s
ubuntu-20.04 Release LLVM-12 libstdc++	31s
ubuntu-20.04 Debug LLVM-10 libc++	34s
ubuntu-20.04 Debug LLVM-12 libc++	2m 26s
ubuntu-20.04 Debug LLVM-10 libstdc++	32s
ubuntu-20.04 Debug LLVM-12 libstdc++	37s
all-checks	1s
	45m 6s

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