patch 8.0.1780: test fails because Vim in a terminal uses wrong 'encoding'

Problem:    Test fails because Vim in a terminal uses wrong 'encoding'.
Solution:   Set encoding in the test where it matters. (James McCoy,
            closes #2847)

src/version.c

@@ -761,6 +761,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1780,
 /**/
     1779,
 /**/