updated for version 7.4.641

Problem:    The tabline menu was using ":999tabnew" which is now invalid.
Solution:   Use ":$tabnew" instead. (Florian Degner)

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    641,
 /**/
     640,
 /**/