updated for version 7.3.015

Problem:    Test is using error message that no longer exists.
Solution:   Change E106 to E121. (Dominique Pelle)

src/version.c

@@ -714,6 +714,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    15,
 /**/
     14,
 /**/