Fix Nix pkg-config support #1318

Job	Run time
Formatting	6s
Documentation	1m 0s
Analyze	2m 1s
Windows VS2019 x86 Shared Debug	3m 36s
Windows VS2019 x86 Shared Release	3m 41s
Windows VS2019 x86 Static Debug	3m 32s
Windows VS2019 x86 Static Release	3m 45s
Windows VS2019 x64 Shared Debug	3m 22s
Windows VS2019 x64 Shared Release	3m 43s
Windows VS2019 x64 Static Debug	3m 24s
Windows VS2019 x64 Static Release	3m 43s
Windows VS2022 x86 Shared Debug	3m 22s
Windows VS2022 x86 Shared Release	4m 23s
Windows VS2022 x86 Static Debug	3m 28s
Windows VS2022 x86 Static Release	4m 15s
Windows VS2022 x64 Shared Debug	4m 0s
Windows VS2022 x64 Shared Release	3m 32s
Windows VS2022 x64 Static Debug	4m 4s
Windows VS2022 x64 Static Release	4m 19s
Windows ClangCL Shared Debug	4m 53s
Windows ClangCL Shared Release	5m 48s
Windows ClangCL Static Debug	5m 25s
Windows ClangCL Static Release	5m 27s
Windows Clang Shared Debug	2m 41s
Windows Clang Shared Release	2m 40s
Windows Clang Static Debug	2m 43s
Windows Clang Static Release	2m 44s
Linux GCC Shared Debug	1m 16s
Linux GCC Shared Release	1m 24s
Linux GCC Static Debug	1m 10s
Linux GCC Static Release	1m 20s
Linux Clang Shared Debug	1m 20s
Linux Clang Shared Release	1m 42s
Linux Clang Static Debug	1m 18s
Linux Clang Static Release	1m 31s
MacOS Shared Debug	59s
MacOS Shared Release	1m 5s
MacOS Static Debug	1m 2s
MacOS Static Release	1m 6s
	1h 50m 50s

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