die if the forked extract exited with error
die if the forked extract exited with error

Should we pass on bad exit codes from RunFork to those waitpids as well?
Seems like the right thing, though I don't know the code.

alvations/mosesdecoder,KonceptGeek/mosesdecoder,emjotde/mosesdecoder_nmt,moses-smt/mosesdecoder,KonceptGeek/mosesdecoder,emjotde/mosesdecoder_nmt,KonceptGeek/mosesdecoder,KonceptGeek/mosesdecoder,emjotde/mosesdecoder_nmt,moses-smt/mosesdecoder,alvations/mosesdecoder,tofula/mosesdecoder,tofula/mosesdecoder,pjwilliams/mosesdecoder,hychyc07/mosesdecoder,hychyc07/mosesdecoder,tofula/mosesdecoder,moses-smt/mosesdecoder,emjotde/mosesdecoder_nmt,hychyc07/mosesdecoder,tofula/mosesdecoder,moses-smt/mosesdecoder,emjotde/mosesdecoder_nmt,emjotde/mosesdecoder_nmt,alvations/mosesdecoder,moses-smt/mosesdecoder,moses-smt/mosesdecoder,pjwilliams/mosesdecoder,alvations/mosesdecoder,emjotde/mosesdecoder_nmt,moses-smt/mosesdecoder,KonceptGeek/mosesdecoder,hychyc07/mosesdecoder,tofula/mosesdecoder,hychyc07/mosesdecoder,tofula/mosesdecoder,KonceptGeek/mosesdecoder,alvations/mosesdecoder,tofula/mosesdecoder,moses-smt/mosesdecoder,moses-smt/mosesdecoder,KonceptGeek/mosesdecoder,moses-smt/mosesdecoder,pjwilliams/mosesdecoder,alvations/mosesdecoder,pjwilliams/mosesdecoder,hychyc07/mosesdecoder,pjwilliams/mosesdecoder,pjwilliams/mosesdecoder,emjotde/mosesdecoder_nmt,KonceptGeek/mosesdecoder,alvations/mosesdecoder,emjotde/mosesdecoder_nmt,pjwilliams/mosesdecoder,alvations/mosesdecoder,KonceptGeek/mosesdecoder,hychyc07/mosesdecoder,tofula/mosesdecoder,alvations/mosesdecoder,alvations/mosesdecoder,alvations/mosesdecoder,hychyc07/mosesdecoder,KonceptGeek/mosesdecoder,pjwilliams/mosesdecoder,tofula/mosesdecoder,pjwilliams/mosesdecoder,tofula/mosesdecoder,moses-smt/mosesdecoder,tofula/mosesdecoder,emjotde/mosesdecoder_nmt,hychyc07/mosesdecoder,hychyc07/mosesdecoder,pjwilliams/mosesdecoder