Remove unused set_seg_base

diff -r 0798f7cfc709 include/asm-x86_64/desc.h
@@ -107,16 +107,6 @@ static inline void set_ldt_desc(unsigned
 			      DESC_LDT, size * 8 - 1);
 }
 
-static inline void set_seg_base(unsigned cpu, int entry, void *base)
-{ 
-	struct desc_struct *d = &cpu_gdt(cpu)[entry];
-	u32 addr = (u32)(u64)base;
-	BUG_ON((u64)base >> 32); 
-	d->base0 = addr & 0xffff;
-	d->base1 = (addr >> 16) & 0xff;
-	d->base2 = (addr >> 24) & 0xff;
-} 
-
 #define LDT_entry_a(info) \
 	((((info)->base_addr & 0x0000ffff) << 16) | ((info)->limit & 0x0ffff))
 /* Don't allow setting of the lm bit. It is useless anyways because