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/misc1.c b/src/misc1.c
index 27ca83e..a764a7b 100644
--- a/src/misc1.c
+++ b/src/misc1.c
@@ -1976,7 +1976,7 @@
     if (!wp->w_p_wrap)
 	return 1;
 
-#ifdef FEAT_VERTSPLIT
+#ifdef FEAT_WINDOWS
     if (wp->w_width == 0)
 	return 1;
 #endif
@@ -2052,7 +2052,7 @@
     if (!wp->w_p_wrap)
 	return lines + 1;
 
-#ifdef FEAT_VERTSPLIT
+#ifdef FEAT_WINDOWS
     if (wp->w_width == 0)
 	return lines + 1;
 #endif