patch 9.0.0651: build fails without the +conceal feature

Problem:    Build fails without the +conceal feature.
Solution:   Rename called function.
diff --git a/src/version.c b/src/version.c
index 000c1e3..c84d309 100644
--- a/src/version.c
+++ b/src/version.c
@@ -700,6 +700,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    651,
+/**/
     650,
 /**/
     649,