Fix for bash loadable builtin sleep issue

The rootcause of the sleep execution failure has found with 
the SIGCHLD affects the execution of select().

An issue fixed by ignoring the SIGCHLD signal during the 
select() execution.

Signed-off-by: Thiruvadi Rajaraman <trajaraman@mvista.com>
 
Index: bash-4.2/lib/sh/ufuncs.c
===================================================================
--- bash-4.2.orig/lib/sh/ufuncs.c
+++ bash-4.2/lib/sh/ufuncs.c
@@ -19,7 +19,7 @@
 */
 
 #include "config.h"
-
+#include <signal.h>
 #include "bashtypes.h"
 
 #if defined (TIME_WITH_SYS_TIME)
@@ -86,6 +86,7 @@ fsleep(sec, usec)
      unsigned int sec, usec;
 {
   struct timeval tv;
+  signal(SIGCHLD, NULL);
 
   tv.tv_sec = sec;
   tv.tv_usec = usec;