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/move.c b/src/move.c
index a505873..1a00a4d 100644
--- a/src/move.c
+++ b/src/move.c
@@ -990,7 +990,7 @@
 	curwin->w_wrow = curwin->w_height - 1;
     }
     else if (curwin->w_p_wrap
-#ifdef FEAT_VERTSPLIT
+#ifdef FEAT_WINDOWS
 	    && curwin->w_width != 0
 #endif
 	    )
@@ -1096,7 +1096,7 @@
 	    && curwin->w_height != 0
 	    && curwin->w_cursor.lnum == curwin->w_topline
 	    && width > 0
-#ifdef FEAT_VERTSPLIT
+#ifdef FEAT_WINDOWS
 	    && curwin->w_width != 0
 #endif
 	    )
@@ -1259,7 +1259,7 @@
      */
     wrow = curwin->w_wrow;
     if (curwin->w_p_wrap
-#ifdef FEAT_VERTSPLIT
+#ifdef FEAT_WINDOWS
 		&& curwin->w_width != 0
 #endif
 	    )
@@ -1468,7 +1468,7 @@
     end_row += plines(curwin->w_topline - 1);
 #endif
     if (curwin->w_p_wrap
-#ifdef FEAT_VERTSPLIT
+#ifdef FEAT_WINDOWS
 		&& curwin->w_width != 0
 #endif
 	    )
@@ -1532,7 +1532,7 @@
     start_row = curwin->w_wrow - plines(curwin->w_topline);
 #endif
     if (curwin->w_p_wrap
-#ifdef FEAT_VERTSPLIT
+#ifdef FEAT_WINDOWS
 		&& curwin->w_width != 0
 #endif
 	    )