ash: kill background processes on SIGINT

Consider this script:

   #!/bin/sh -e
   f() {
       for n in $(seq 1 10); do
           echo "Background $n ..."
           sleep 1
       done
   }
   f 1 &
   f 2 &
   f 3 &
   wait

If this was interrupted by Ctrl+C the background jobs continued to
run.  Avoid this by sending SIGINT to all children of the shell.

Saves 16 bytes.

(See GitHub PR #500)

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