bitbake/runqueue.py: Move SIGCHLD handler to wrap none server sleep call

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/runqueue.py

@@ -748,9 +748,6 @@ class RunQueueData:
                            self.rqdata.runq_depends[task],
                            self.rqdata.runq_revdeps[task])
 
-# Dummy signal handler to ensure we break out of sleep upon SIGCHLD
-def chldhandler(signum, stackframe):
-    pass
 
 class RunQueue:
     def __init__(self, cooker, cfgData, dataCache, taskData, targets):
@@ -764,8 +761,6 @@ class RunQueue:
 
         self.state = runQueuePrepare
 
-        signal.signal(signal.SIGCHLD, chldhandler)
-
     def check_stamps(self):
         unchecked = {}
         current = []
@@ -1107,8 +1102,6 @@ class RunQueueExecute:
             # themselves
             bblogger.handlers = [bb.event.LogHandler()]
 
-            signal.signal(signal.SIGCHLD, signal.SIG_DFL)
-
             self.rq.state = runQueueChildProcess
             # Make the child the process group leader
             os.setpgid(0, 0)