ia64: make iosapic_version static

iosapic_version is not used outside of xen/arch/ia64/linux-xen/iosapic.c
so it seems senible to make it static.

To be sent to Linux upstream

Signed-off-by: Simon Horman <horms@verge.net.au>

Index: xen-unstable.hg/xen/arch/ia64/linux-xen/iosapic.c
===================================================================
--- xen-unstable.hg.orig/xen/arch/ia64/linux-xen/iosapic.c	2007-11-28 13:23:37.000000000 +0900
+++ xen-unstable.hg/xen/arch/ia64/linux-xen/iosapic.c	2007-11-28 13:23:40.000000000 +0900
@@ -474,7 +474,7 @@ static struct hw_interrupt_type irq_type
 	.set_affinity =	iosapic_set_affinity
 };
 
-unsigned int
+static unsigned int
 iosapic_version (char __iomem *addr)
 {
 	/*
Index: xen-unstable.hg/xen/include/asm-ia64/linux-xen/asm/iosapic.h
===================================================================
--- xen-unstable.hg.orig/xen/include/asm-ia64/linux-xen/asm/iosapic.h	2007-08-16 17:06:40.000000000 +0900
+++ xen-unstable.hg/xen/include/asm-ia64/linux-xen/asm/iosapic.h	2007-11-28 13:23:40.000000000 +0900
@@ -92,7 +92,6 @@ extern int __init iosapic_register_platf
 					   u16 eid, u16 id,
 					   unsigned long polarity,
 					   unsigned long trigger);
-extern unsigned int iosapic_version (char __iomem *addr);
 
 #ifdef CONFIG_NUMA
 extern void __devinit map_iosapic_to_node (unsigned int, int);