macho: do not write out ZEROFILL physically to file
Prior to this change, `__DATA,__bss` and `__DATA,__thread_bss` would
get actually, physically written out to the output file, unnecessarily
filling the output file with 0s.
5eaac2fb99Jakub Konka committed on 1/20/2022, 7:21:58 AM· committed by Andrew Kelleyparent538c9e7