iperf: fix cross-musl.
iperf: fix cross-musl.

coredumb/void-packages,NeoChontrix/void-packages,necrophcodr/void-packages,necrophcodr/void-packages,necrophcodr/void-packages,coredumb/void-packages,coredumb/void-packages,coredumb/void-packages,NeoChontrix/void-packages,NeoChontrix/void-packages,NeoChontrix/void-packages,coredumb/void-packages,NeoChontrix/void-packages,NeoChontrix/void-packages,necrophcodr/void-packages,coredumb/void-packages,necrophcodr/void-packages