File reproducible.patch of Package bubbros

https://sourceforge.net/p/bub-n-bros/patches/3/
Author: Bernhard M. Wiedemann <bwiedemann suse de>
Date: 2019-07-10

use convert -strip to not have .png files contain build time (boo#1047218)

Index: bubbros-1.6.2/bubbob/doc/bonus-doc.py
===================================================================
--- bubbros-1.6.2.orig/bubbob/doc/bonus-doc.py
+++ bubbros-1.6.2/bubbob/doc/bonus-doc.py
@@ -28,7 +28,7 @@ def create_image(name,source,extralines=
     c = src.readline().strip()
     data = src.read()
     src.close()
-    img = os.popen("convert PPM:- doc/images/"+name+'.png','w')
+    img = os.popen("convert -strip PPM:- doc/images/"+name+'.png','w')
     print >> img, 'P6'
     print >> img, source[1][2], source[1][3]+extralines
     print >> img, c