[gtk-doc] common: flush stdout before replacing

[Stefan Sauer <stefkost src gnome org>]

commit ad0539343cdc4da19e40184701250cc0b12d557e
Author: Stefan Sauer <ensonic users sf net>
Date:   Mon Dec 4 17:08:16 2017 +0100

    common: flush stdout before replacing
    
    There should be nothing buffered yet, but lets play safe.

 gtkdoc/common.py |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gtkdoc/common.py b/gtkdoc/common.py
index 126aada..5871465 100644
--- a/gtkdoc/common.py
+++ b/gtkdoc/common.py
@@ -74,6 +74,7 @@ def setup_logging():
     # we get UnicodeEncodeError:
     encoding = sys.stdout.encoding
     if 'PYTHONIOENCODING' not in os.environ and (not encoding or encoding != 'UTF-8'):
+        sys.stdout.flush()
         if six.PY3:
             sys.stdout = open(sys.stdout.fileno(), mode='w', encoding='utf8', buffering=1)
         else: