patch 7.4.2291

Problem:    printf() handles floats wrong when there is a sign.
Solution:   Fix placing the sign.  Add tests. (Dominique Pelle)

src/version.c

@@ -763,6 +763,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2291,
 /**/
     2290,
 /**/