patch 9.0.0921: missing defined(PROTO) in #ifdef

Problem:    Missing defined(PROTO) in #ifdef.
Solution:   Adjust #ifdef so that proto works with different features.
            Clean up some preprocessor indenting.
diff --git a/src/version.c b/src/version.c
index 3dbf2ef..cde6e1d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    921,
+/**/
     920,
 /**/
     919,