clean up render.c a little

server/main.h

@@ -37,7 +37,7 @@ extern char *build_date;
 #define TIME_UNIT (1e6/RENDER_FREQ)
 /* Variable from stone age, still used a lot.  */
 
-extern long int timer;
+extern long timer;
 /* 32 bits at 8Hz will overflow in 2 ^ 29 = 5e8 seconds = 17 years.
  * If you get an overflow, please mail us and we will fix this personally
  * for you ! */