patch 8.0.1740: warning for signed-unsigned incompatibility

Problem:    Warning for signed-unsigned incompatibility.
Solution:   Change type from "char *" to "char_u *". (John Marriott)
diff --git a/src/version.c b/src/version.c
index a73994b..7ebc071 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1740,
+/**/
     1739,
 /**/
     1738,