pull all non-X11 headers from calmwm.h and place them only where they

are required.

encourged to go all the way by oga@

screen.c

@@ -18,6 +18,16 @@
  * $Id$
  */
 
+#include <sys/param.h>
+#include <sys/queue.h>
+
+#include <err.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+
 #include "calmwm.h"
 
 struct screen_ctx *