Make build-many-glibcs.py flush stdout before execv.

When build-many-glibcs.py re-execs itself with execv, any buffered
output on stdout may be lost (in particular, messages intended to go
to a bot's log about the re-exec taking place).  This patch makes it
flush stdout before execv, similar to the flush before running a
subprocess from the bot that is done to ensure output appears in the
right order.

	* scripts/build-many-glibcs.py (Context.exec_self): Flush stdout
	before calling execv.

ChangeLog

@@ -1,3 +1,8 @@
+2016-12-16  Joseph Myers  <joseph@codesourcery.com>
+
+	* scripts/build-many-glibcs.py (Context.exec_self): Flush stdout
+	before calling execv.
+
 2016-12-16  Adhemerval Zanella  <adhemerval.zanella@linaro.org>
 
 	[BZ# 20971]

scripts/build-many-glibcs.py

@@ -93,6 +93,7 @@ class Context(object):
 
     def exec_self(self):
         """Re-execute this script with the same arguments."""
+        sys.stdout.flush()
         os.execv(sys.executable, [sys.executable] + sys.argv)
 
     def get_build_triplet(self):