(PATCH) small fix for building with new gcc

[Filip Kalinski]

This patch fixes problem with compiling the kernel with gcc 3.x.
It does not like that xtime is defined differently in linux/sched.h
(as "volatile"), and doesn't want to proceed.

Filip Kaliński <[e-mail]>

--- linux-vanilla/kernel/timer.c	Sun Nov  4 16:27:47 2001
+++ linux-modfied/kernel/timer.c	Fri Nov 23 23:58:34 2001
@@ -32,7 +32,7 @@
 long tick = (1000000 + HZ/2) / HZ;	/* timer interrupt period */
 
 /* The current time */
-struct timeval xtime __attribute__ ((aligned (16)));
+volatile struct timeval xtime __attribute__ ((aligned (16)));
 
 /* Don't completely fail for HZ > 500.  */
 int tickadj = 500/HZ ? : 1;		/* microsecs */