x86/ipipe: fix function name macro collision

do not include asm/hw_irq.h in asm/desc.h anymore, may cause function/
macro collision on "set_fs" in early printk-code
Signed-off-by: Henning Schild <henning.schild@siemens.com>

arch/x86/include/asm/desc.h

@@ -4,7 +4,6 @@
 #include <asm/desc_defs.h>
 #include <asm/ldt.h>
 #include <asm/mmu.h>
-#include <asm/hw_irq.h>
 
 #include <linux/smp.h>
 #include <linux/percpu.h>
@@ -380,6 +379,10 @@ extern int first_system_vector;
 /* used_vectors is BITMAP for irq is not managed by percpu vector_irq */
 extern unsigned long used_vectors[];
 
+#ifdef CONFIG_IPIPE
+extern int vector_irq[NR_VECTORS];
+#endif
+
 static inline void alloc_system_vector(int vector)
 {
 	if (!test_bit(vector, used_vectors)) {