x86: fix compilation error in VisWS

/* Have we found an MP table */

int smp_found_config;

/*

 * Various Linux-internal data structures created from the

 * MP-table.

 */

int apic_version [MAX_APICS];

int pic_mode;

unsigned long mp_lapic_addr;

/* Processor that is doing the boot up */

unsigned int boot_cpu_physical_apicid = -1U;

/* Bitmask of physically existing CPUs */

physid_mask_t phys_cpu_present_map;

unsigned int __initdata maxcpus = NR_CPUS;

extern unsigned int __cpuinitdata maxcpus;

/*

 * The Visual Workstation is Intel MP compliant in the hardware