Include stdlib.h, better than conflicting/missing decls

x11/treewm/patches/patch-xprop_dsimple_c

@@ -0,0 +1,29 @@
+$OpenBSD: patch-xprop_dsimple_c,v 1.1 2017/05/04 13:14:02 jca Exp $
+--- xprop/dsimple.c.orig
++++ xprop/dsimple.c
+@@ -32,6 +32,7 @@ from The Open Group.
+ #include <X11/Xutil.h>
+ #include <X11/cursorfont.h>
+ #include <stdio.h>
++#include <stdlib.h>
+ /*
+  * Other_stuff.h: Definitions of routines in other_stuff.
+  *
+@@ -69,7 +70,7 @@ extern int screen;
+ char *Malloc(size)
+      unsigned size;
+ {
+-	char *data, *malloc();
++	char *data;
+ 
+ 	if (!(data = malloc(size)))
+ 	  Fatal_Error("Out of memory!");
+@@ -85,7 +86,7 @@ char *Realloc(ptr, size)
+         char *ptr;
+         int size;
+ {
+-	char *new_ptr, *realloc();
++	char *new_ptr;
+ 
+ 	if (!ptr)
+ 	  return(Malloc(size));