[PATCH] ia64: unwind.c fix for spinlock-debug compilation

If you try to compile 2.6.0-test[45] with spinlock debugging on, then
unwind.c won't compile, because it uses a #define magic that hides
the variable in the spinlock debugging code (also called magic).

arch/ia64/kernel/unwind.c

@@ -1171,9 +1171,10 @@ desc_spill_sprel_p (unsigned char qp, unw_word t, unsigned char abreg, unw_word
 static inline unw_hash_index_t
 hash (unsigned long ip)
 {
-#	define magic	0x9e3779b97f4a7c16	/* based on (sqrt(5)/2-1)*2^64 */
+#	define hashmagic	0x9e3779b97f4a7c16	/* based on (sqrt(5)/2-1)*2^64 */
 
-	return (ip >> 4)*magic >> (64 - UNW_LOG_HASH_SIZE);
+	return (ip >> 4)*hashmagic >> (64 - UNW_LOG_HASH_SIZE);
+#undef hashmagic
 }
 
 static inline long