patch 8.0.1118: FEAT_WINDOWS adds a lot of #ifdefs

Problem:    FEAT_WINDOWS adds a lot of #ifdefs while it is nearly always
            enabled and only adds 7% to the binary size of the tiny build.
Solution:   Graduate FEAT_WINDOWS.
diff --git a/src/vim.h b/src/vim.h
index cbab101..f497cbc 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -859,24 +859,12 @@
 #define FINDFILE_DIR	1	/* only directories */
 #define FINDFILE_BOTH	2	/* files and directories */
 
-#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)
-# define W_VSEP_WIDTH(wp) (wp->w_vsep_width)
-#else
-# define W_WINCOL(wp)	0
-# define W_WIDTH(wp)	Columns
-# define W_ENDCOL(wp)	Columns
-# define W_VSEP_WIDTH(wp) 0
-#endif
-#ifdef FEAT_WINDOWS
-# define W_STATUS_HEIGHT(wp) (wp->w_status_height)
-# define W_WINROW(wp)	(wp->w_winrow)
-#else
-# define W_STATUS_HEIGHT(wp) 0
-# define W_WINROW(wp)	0
-#endif
+#define W_WINCOL(wp)	(wp->w_wincol)
+#define W_WIDTH(wp)	(wp->w_width)
+#define W_ENDCOL(wp)	(wp->w_wincol + wp->w_width)
+#define W_VSEP_WIDTH(wp) (wp->w_vsep_width)
+#define W_STATUS_HEIGHT(wp) (wp->w_status_height)
+#define W_WINROW(wp)	(wp->w_winrow)
 
 #ifdef NO_EXPANDPATH
 # define gen_expand_wildcards mch_expand_wildcards