patch 8.0.1454: when in silent mode too much output is buffered

Problem:    When in silent mode too much output is buffered.
Solution:   Use line buffering instead of fully buffered. (Brian M. Carlson,
            closes #2537)

src/version.c

@@ -771,6 +771,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1454,
 /**/
     1453,
 /**/