patch 8.0.1091: test for <cexpr> fails without +balloon_eval feature

Problem:    Test for <cexpr> fails without +balloon_eval feature.
Solution:   Remove #ifdefs.
diff --git a/src/version.c b/src/version.c
index b105496..e323995 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1091,
+/**/
     1090,
 /**/
     1089,