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/vim.h b/src/vim.h
index 9e4406a..a7443e9 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -810,7 +810,7 @@
#define FINDFILE_DIR 1 /* only directories */
#define FINDFILE_BOTH 2 /* files and directories */
-#ifdef FEAT_VERTSPLIT
+#ifdef FEAT_WINDOWS
# define W_WINCOL(wp) (wp->w_wincol)
# define W_WIDTH(wp) (wp->w_width)
# define W_ENDCOL(wp) (wp->w_wincol + wp->w_width)