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.

src/workshop.c

@@ -1265,7 +1265,6 @@ load_window(
     }
     else
     {
-#ifdef FEAT_WINDOWS
 	/* buf is in a window */
 	if (win != curwin)
 	{
@@ -1273,7 +1272,6 @@ load_window(
 	    /* wsdebug("load_window: window enter %s\n",
 		    win->w_buffer->b_sfname); */
 	}
-#endif
 	if (lnum > 0 && win->w_cursor.lnum != lnum)
 	{
 	    warp_to_pc(lnum);