Portability: remove explicit check for libdl (#1963) #244

Job	Run time
CodeQL-tests	35m 48s
build-tests(ubuntu-22.04,gcc,default)	6m 24s
functionality-tests	18m 13s
source-maintenance-tests	3m 4s
build-tests(ubuntu-22.04,gcc,minimal)	5m 2s
build-tests(ubuntu-22.04,gcc,maximus)	7m 8s
build-tests(ubuntu-22.04,clang,default)	7m 34s
build-tests(ubuntu-22.04,clang,minimal)	5m 27s
build-tests(ubuntu-22.04,clang,maximus)	8m 26s
	1h 37m 6s

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