patch 9.0.0075: some compilers warn for using an uninitialized variable

Problem:    Some compilers warn for using an uninitialized variable. (Tony
            Mechelynck)
Solution:   Initialize the variable.

src/version.c

@@ -735,6 +735,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    75,
 /**/
     74,
 /**/