x86: removed unused variable

This variable is not used anywere, and is then removed
Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

include/asm-x86/desc_64.h

@@ -30,11 +30,6 @@ static inline unsigned long __store_tr(void)
 
 #define store_tr(tr) (tr) = __store_tr()
 
-/*
- * This is the ldt that every process will get unless we need
- * something other than this.
- */
-extern struct desc_struct default_ldt[];
 extern struct gate_struct idt_table[];
 extern struct desc_ptr cpu_gdt_descr[];