patch 7.4.1164

Problem:    No tests for comparing special variables.  Error in jsondecode()
            not reported.  test_json does not work Japanse system.
Solution:   Set scriptencoding. (Ken Takata) Add a few more tests. Add error.

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1164,
 /**/
     1163,
 /**/