Fixes LM flag for CPUID extended feature mask (#1202)

qemu/target-i386/unicorn.c

@@ -160,6 +160,10 @@ void x86_reg_reset(struct uc_struct *uc)
             env->hflags &= ~(HF_ADDSEG_MASK);
             env->efer |= MSR_EFER_LMA | MSR_EFER_LME; // extended mode activated
             cpu_x86_update_cr0(env, CR0_PE_MASK); // protected mode
+            /* If we are operating in 64bit mode then add the Long Mode flag
+             * to the CPUID feature flag
+             */
+            env->features[FEAT_8000_0001_EDX] |= CPUID_EXT2_LM;
             break;
     }
 }