bin/wc: buffer output & delay process.exit()
bin/wc: buffer output & delay process.exit()

I was seeing spurious failures of the wc command test, where the first
part (line count) would be shown, but not the next 2 counts.  Somehow,
maybe, sys_exit was interleaving between the first and second
sys_write?

flat1101/browsix,flat1101/browsix,b1101/browsix,flat1101/browsix,b1101/browsix,flat1101/browsix,b1101/browsix,b1101/browsix