[popen] define shell in platform case first
[popen] define shell in platform case first

upfluence/sensu,pauloconnor/sensu,crewton/sensu,withnale/sensu,sensu/sensu,javrasya/sensu,yonglehou/sensu,solarkennedy/sensu,keymone/sensu,npe9/sensu,somic/sensu,zuazo-forks/sensu,roobert/sensu,quodlibetor/sensu,Tapjoy/sensu-mirror,rbramwell/sensu,cread/sensu,miyakawataku/sensu,portertech/sensu,m4ce/sensu,bf4/sensu