Rename stdin/stdout/stderr to proc_*

Because we include stdio.h now, Solaris defines stdin, stdout, and
stderr in a way that they can't be used to name the args to the spawn
function.  Hence rename these args.
1 job for master in 8 minutes and 25 seconds (queued for 3 seconds)
Status Name Job ID Coverage
  Test
passed test #132

00:08:25