ddddd8961b ci: Use busybox utils for one build (MarcoFalke)
Pull request description:
To make sure Bitcoin Core can be built with BusyBox, see https://github.com/bitcoin/bitcoin/pull/16927#issuecomment-536483706
ACKs for top commit:
laanwj:
ACK ddddd8961b
Tree-SHA512: da3a4654ee7975206d04643675d309b4973a510ca344acaec97fb1ed19c43cf13489bdf236c92c4a90499ec5b3c18c3338fff096110b26abee5ffe955089f267