Bug 5428: Warn if pkg-config is not found (#1902) #3747

Job	Run time
source-maintenance-tests	2m 52s
functionality-tests	16m 51s
CodeQL-tests	37m 58s
build-tests(ubuntu-22.04,gcc,default)	10m 32s
build-tests(ubuntu-22.04,gcc,minimal)	5m 46s
build-tests(ubuntu-22.04,gcc,maximus)	12m 5s
build-tests(ubuntu-22.04,clang,default)	13m 13s
build-tests(ubuntu-22.04,clang,minimal)	7m 32s
build-tests(ubuntu-22.04,clang,maximus)	15m 11s
build-tests(macos-14,clang,default)	10m 17s
build-tests(macos-14,clang,minimal)	6m 12s
build-tests(macos-14,clang,maximus)	11m 22s
	2h 29m 51s

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