Remove/change bad prototypes

In modules/system/time, a bad prototype for "time" was left. There is too some problem with filno under OpenBSD. Currently, the only known OS that don't want to export fileno with c89/c99 standard, is linux, so #ifdef/#endif the prototypes only for linux. (OpenBSD seems to define them as MACROs, that led to errors)

modules/src/system/time.c

@@ -4,12 +4,10 @@
  */
 /* $Id$ */
 
+#include <time.h>
 #include "system.h"
 
-long time();
-
-long
-sys_time()
+long sys_time()
 {
 	return time((long *) 0);
 }