[IA64] fix userspace compile error in gcc_intrin.h

Fixes userspace build errors when linux/ipv6.h is included such as in the
dhcpv6 package under fedora. Likely causes other userspace build errors as
well. I found this in akpm's tree from 2.6.18 but could not find any case
of anyone proposing it for the main tree.

Signed-off-by: Doug Chapman <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Tony Luck <[e-mail]>

include/asm-ia64/gcc_intrin.h

···
 extern void ia64_bad_param_for_setreg (void);
 extern void ia64_bad_param_for_getreg (void);
 
+#ifdef __KERNEL__
 register unsigned long ia64_r13 asm ("r13") __used;
+#endif
 
 #define ia64_setreg(regnum, val)						\
 ({										\