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/memline.c b/src/memline.c
index 458b545..59393ae 100644
--- a/src/memline.c
+++ b/src/memline.c
@@ -2544,8 +2544,7 @@
     return ml_append_int(curbuf, lnum, line, len, newfile, FALSE);
 }
 
-#if defined(FEAT_SPELL) || (defined(FEAT_QUICKFIX) && defined(FEAT_WINDOWS)) \
-	|| defined(PROTO)
+#if defined(FEAT_SPELL) || defined(FEAT_QUICKFIX) || defined(PROTO)
 /*
  * Like ml_append() but for an arbitrary buffer.  The buffer must already have
  * a memline.
@@ -3112,7 +3111,8 @@
 }
 
 /*
- * Delete line 'lnum' in the current buffer.
+ * Delete line "lnum" in the current buffer.
+ * When "message" is TRUE may give a "No lines in buffer" message.
  *
  * Check: The caller of this function should probably also call
  * deleted_lines() after this.