patch 7.4.704

Problem:    Searching for a character matches an illegal byte and causes
            invalid memory access. (Dominique Pelle)
Solution:   Do not match an invalid byte when search for a character in a
            string.  Fix equivalence classes using negative numbers, which
            result in illegal bytes.

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    704,
 /**/
     703,
 /**/