Fix missing prototype

--- devtodo-0.1.20/src/todoterm.cc.orig	2008-12-10 02:50:35.447251360 -0500
+++ devtodo-0.1.20/src/todoterm.cc	2008-12-10 02:50:58.133126032 -0500
@@ -7,6 +7,7 @@
 #include <stdexcept>
 #include <curses.h>
 #include <term.h>
+#include <stdlib.h>
 
 static char info[2048];
 static bool term_initialized;