Clarify --enable-ecap failure on missing shared library support #261

Job	Run time
CodeQL-tests	23m 15s
functionality-tests	19m 7s
source-maintenance-tests	2m 53s
build-tests(ubuntu-22.04,gcc,default)	5m 22s
build-tests(ubuntu-22.04,gcc,minimal)	4m 21s
build-tests(ubuntu-22.04,gcc,maximus)	5m 58s
build-tests(ubuntu-22.04,clang,default)	6m 37s
build-tests(ubuntu-22.04,clang,minimal)	5m 0s
build-tests(ubuntu-22.04,clang,maximus)	7m 51s
	1h 20m 24s

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