contrib: add check for wget command in install_db4.sh#1
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This PR is motivated by bitcoin@7bb8eb0 (see also bitcoin#23579) and ensures that
install_db4.shwill check forcurlandwgetutilities. Currently, the conditional statement in thehttp_get()function assumes thatwgetis always available but we actually do not know it since there is no check or validation for thewgetcommand. So let's make sure that we check for both commands and print an error message if they are missing.