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Fix a few more issues

--- a/libdraw/window.c

+++ b/libdraw/window.c

@@ -1,4 +1,7 @@

 #include <stdlib.h>

+#include <sys/types.h>

+#include <unistd.h>

+#include <assert.h>

 #include "draw.h"

 typedef struct Memimage Memimage;

@@ -15,7 +18,6 @@

 	d = image->display;

 	if(d != fill->display){

-		werrstr("allocscreen: image and fill on different displays");

 		return nil;

 	}

 	s = malloc(sizeof(Screen));

@@ -136,7 +138,7 @@

 	if(n < 0){

     Ridiculous:

-		fprint(2, "top/bottom: ridiculous number of windows\n");

+		fprintf(2, "top/bottom: ridiculous number of windows\n");

 		return;

 	}

 	if(n == 0)

@@ -152,7 +154,7 @@

 	d = w[0]->display;

 	for(i=1; i<n; i++)

 		if(w[i]->display != d){

-			fprint(2, "top/bottom: windows not on same screen\n");

+			fprintf(2, "top/bottom: windows not on same screen\n");

 			return;

 		}