[PATCH] uml: Avoids compile failure when host misses tkill().

Avoids compile failure when host misses tkill(), by simply using kill() in
that case.
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade_spam@yahoo.it>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/um/os-Linux/process.c

@@ -93,8 +93,11 @@ void os_kill_process(int pid, int reap_child)
 
 void os_usr1_process(int pid)
 {
+#ifdef __NR_tkill
 	syscall(__NR_tkill, pid, SIGUSR1);
-	/* kill(pid, SIGUSR1); */
+#else
+	kill(pid, SIGUSR1);
+#endif
 }
 
 int os_getpid(void)