Add internal API task_reparent(), used in posix_spawn(). Move libc/spawn/lib_ps.c to sched/task_posixspawn.c; Move libc/spawn/spawn.h to include/nuttx/spawn.h

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5531 42af7a65-404d-4744-a932-0658087f49c3

binfmt/binfmt_exec.c

@@ -97,7 +97,6 @@ int exec(FAR const char *filename, FAR const char **argv,
 {
 #ifdef CONFIG_SCHED_ONEXIT
   FAR struct binary_s *bin;
-  int errorcode;
   int pid;
   int ret;