[IA64] fix circular dependency on generation of asm-offsets.h

Fix?  One ugly hack is replaced by a different ugly hack.

Signed-off-by: Tony Luck <tony.luck@intel.com>
diff --git a/arch/ia64/kernel/asm-offsets.c b/arch/ia64/kernel/asm-offsets.c
index f6a2342..7722565 100644
--- a/arch/ia64/kernel/asm-offsets.c
+++ b/arch/ia64/kernel/asm-offsets.c
@@ -4,6 +4,7 @@
  * to extract and format the required data.
  */
 
+#define ASM_OFFSETS_C 1
 #include <linux/config.h>
 
 #include <linux/sched.h>