fix non-ACPI IOAPIC build

arch/i386/kernel/mpparse.c

@@ -808,6 +808,7 @@ void __init find_smp_config (void)
 		smp_scan_config(address, 0x400);
 }
 
+int (*platform_rename_gsi)(int ioapic, int gsi);
 
 /* --------------------------------------------------------------------------
                             ACPI-based MP Configuration
@@ -1055,8 +1056,6 @@ void __init mp_config_acpi_legacy_irqs (void)
 	}
 }
 
-int (*platform_rename_gsi)(int ioapic, int gsi);
-
 void mp_register_gsi (u32 gsi, int edge_level, int active_high_low)
 {
 	int			ioapic = -1;

include/asm-i386/acpi.h

@@ -128,7 +128,6 @@ static inline void disable_acpi(void)
 #define FIX_ACPI_PAGES 4
 
 extern int acpi_gsi_to_irq(u32 gsi, unsigned int *irq);
-extern int (*platform_rename_gsi)(int ioapic, int gsi);
 
 #ifdef CONFIG_X86_IO_APIC
 extern int skip_ioapic_setup;
@@ -156,6 +155,8 @@ static inline void disable_ioapic_setup(void)
 
 #endif
 
+extern int (*platform_rename_gsi)(int ioapic, int gsi);
+
 #ifdef CONFIG_ACPI_PCI
 static inline void acpi_noirq_set(void) { acpi_noirq = 1; }
 static inline void acpi_disable_pci(void)