Remove GC leftovers from pkg-config file #157

Job	Run time
Cross-build for arm-linux-gnueabihf LLVM-13 Release	1m 32s
windows-2022 Release x64_x86	2m 18s
Cross-build for aarch64-linux-gnu LLVM-13 Release	1m 23s
Cross-build for arm-linux-gnueabihf LLVM-14 Release	1m 47s
windows-2022 Release x64	2m 4s
windows-2022 Debug x64_x86	2m 50s
Cross-build for aarch64-linux-gnu LLVM-14 Release	1m 18s
windows-2022 Debug x64	1m 12s
Cross-build for arm-linux-gnueabihf LLVM-13 Debug	2m 53s
ubuntu-22.04 Release LLVM-13 libc++	53s
windows-2019 Release x64_x86	1m 59s
Cross-build for aarch64-linux-gnu LLVM-13 Debug	2m 40s
windows-2019 Release x64	1m 41s
Cross-build for arm-linux-gnueabihf LLVM-14 Debug	2m 24s
ubuntu-22.04 Release LLVM-14 libc++	33s
windows-2019 Debug x64_x86	2m 30s
Cross-build for aarch64-linux-gnu LLVM-14 Debug	2m 47s
ubuntu-22.04 Release LLVM-15 libc++	37s
windows-2019 Debug x64	1m 15s
ubuntu-22.04 Release LLVM-13 libstdc++	50s
ubuntu-22.04 Release LLVM-14 libstdc++	28s
ubuntu-22.04 Release LLVM-15 libstdc++	47s
ubuntu-22.04 Debug LLVM-13 libc++	45s
ubuntu-22.04 Debug LLVM-14 libc++	37s
ubuntu-22.04 Debug LLVM-15 libc++	43s
ubuntu-22.04 Debug LLVM-13 libstdc++	35s
ubuntu-22.04 Debug LLVM-14 libstdc++	52s
ubuntu-22.04 Debug LLVM-15 libstdc++	38s
ubuntu-20.04 Release LLVM-10 libc++	31s
ubuntu-20.04 Release LLVM-12 libc++	36s
ubuntu-20.04 Release LLVM-10 libstdc++	33s
ubuntu-20.04 Release LLVM-12 libstdc++	47s
ubuntu-20.04 Debug LLVM-10 libc++	56s
ubuntu-20.04 Debug LLVM-12 libc++	36s
ubuntu-20.04 Debug LLVM-10 libstdc++	44s
ubuntu-20.04 Debug LLVM-12 libstdc++	33s
all-checks	1s
	46m 8s

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