patch 7.4.2064

Problem:    Coverity warns for possible buffer overflow.
Solution:   Use vim_strcat() instead of strcat().

src/version.c

@@ -758,6 +758,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2064,
 /**/
     2063,
 /**/