patch 8.0.0373: build fails without +folding

Problem:    Build fails without +folding.
Solution:   Move misplaced #ifdef.
diff --git a/src/version.c b/src/version.c
index 3b8c127..b008d14 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    373,
+/**/
     372,
 /**/
     371,