patch 7.4.766

Problem:    Background color check does not work on Tera Term.
Solution:   Also recognize ST as a termination character. (Hirohito Higashi)

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    766,
 /**/
     765,
 /**/