patch 7.4.1611
Problem:    The versplit feature makes the code uneccessary complicated.
Solution:   Remove FEAT_VERTSPLIT, always support vertical splits when
            FEAT_WINDOWS is defined.
diff --git a/src/syntax.c b/src/syntax.c
index 7d2233a..29b6888 100644
--- a/src/syntax.c
+++ b/src/syntax.c
@@ -6783,7 +6783,7 @@
 	     "StatusLine term=reverse,bold cterm=reverse,bold gui=reverse,bold"),
 	CENT("StatusLineNC term=reverse cterm=reverse",
 	     "StatusLineNC term=reverse cterm=reverse gui=reverse"),
-#ifdef FEAT_VERTSPLIT
+#ifdef FEAT_WINDOWS
 	CENT("VertSplit term=reverse cterm=reverse",
 	     "VertSplit term=reverse cterm=reverse gui=reverse"),
 #endif