Bug 5428: Warn if pkg-config is not found #3730

Job	Run time
CodeQL-tests	36m 11s
functionality-tests	17m 3s
source-maintenance-tests	2m 47s
build-tests(ubuntu-22.04,gcc,default)	11m 11s
build-tests(ubuntu-22.04,gcc,minimal)	5m 59s
build-tests(ubuntu-22.04,gcc,maximus)	13m 44s
build-tests(ubuntu-22.04,clang,default)	13m 27s
build-tests(ubuntu-22.04,clang,minimal)	7m 34s
build-tests(ubuntu-22.04,clang,maximus)	15m 49s
build-tests(macos-14,clang,default)	10m 25s
build-tests(macos-14,clang,minimal)	7m 8s
build-tests(macos-14,clang,maximus)	10m 9s
	2h 31m 27s

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