nohup: fix build on Macs (closes #463)
nohup: fix build on Macs (closes #463)

keunwoo/coreutils,filmor/coreutils,silvio/rust-coreutils,Shtong/coreutils,efuquen/coreutils,dokaptur/coreutils,Gianbaoluo/coreutils,dbrgn/coreutils,samfoo/coreutils,sshling/coreutils,hexsel/coreutils,uutils/coreutils,polapl/coreutils,dbrgn/coreutils,Arcterus/coreutils,bundai223/coreutils,wimh/coreutils,tempbottle/coreutils,kball/coreutils,jbcrail/coreutils,dennis/coreutils,Gianbaoluo/coreutils,steveklabnik/coreutils,silvio/rust-coreutils,Shir0kamii/coreutils,kevgeniy/coreutils,wimh/coreutils,sshling/coreutils,mauricio/coreutils,beni55/coreutils,jbcrail/coreutils,Heather/coreutils,Shtong/coreutils,keunwoo/coreutils,Shir0kamii/coreutils,kwantam/coreutils,efuquen/coreutils,kball/coreutils,ebfe/coreutils,kwantam/coreutils,uutils/coreutils,polapl/coreutils,mauricio/coreutils,tempbottle/coreutils,bundai223/coreutils,dennis/coreutils,steveklabnik/coreutils,Arcterus/coreutils,retep998/coreutils,hexsel/coreutils,uutils/coreutils,kevgeniy/coreutils,Heather/coreutils,beni55/coreutils,filmor/coreutils,ebfe/coreutils,dbrgn/coreutils,samfoo/coreutils,retep998/coreutils