rangetimer: fix x86 build failure for the !HRTIMERS case

the timer peek function was on the wrong side of an ifdef,
breaking for the !HRTIMERs case. Just provide an empty inline
for that case since it doesn't make sense in that scenario.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index d93b1e1..508ce20 100644
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -283,6 +283,8 @@
 	return timer->base->cpu_base->hres_active;
 }
 
+extern void hrtimer_peek_ahead_timers(void);
+
 /*
  * The resolution of the clocks. The resolution value is returned in
  * the clock_getres() system call to give application programmers an
@@ -305,6 +307,7 @@
  * is expired in the next softirq when the clock was advanced.
  */
 static inline void clock_was_set(void) { }
+static inline void hrtimer_peek_ahead_timers(void) { }
 
 static inline void hres_timers_resume(void) { }
 
@@ -328,7 +331,6 @@
 
 
 DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
-extern void hrtimer_peek_ahead_timers(void);
 
 
 /* Exported timer functions: */