Fix job control

Patch was taken from https://git.alpinelinux.org/cgit/aports/tree/main/bash/fix-jobs.patch

See also "Bash 4.4.12-r2 jobs hangs on arm (alpine 3.7)", https://bugs.alpinelinux.org/issues/8447
--- a/jobs.c
+++ b/jobs.c
@@ -4326,10 +4326,8 @@ just_bail:
   if (js.c_childmax < 0)
     js.c_childmax = DEFAULT_CHILD_MAX;
 
-#if 0
   if (js.c_childmax > MAX_CHILD_MAX)
     js.c_childmax = MAX_CHILD_MAX;
-#endif
 
   return job_control;
 }
@@ -4707,10 +4705,8 @@ mark_dead_jobs_as_notified (force)
   if (js.c_childmax < 0)
     js.c_childmax = DEFAULT_CHILD_MAX;
 
-#if 0
   if (js.c_childmax > MAX_CHILD_MAX)
     js.c_childmax = MAX_CHILD_MAX;
-#endif
 
   /* Don't do anything if the number of dead processes is less than CHILD_MAX
      and we're not forcing a cleanup. */