PIC fixes for global vars

[r25655]

ir/be/beabi.c

@@ -2198,7 +2198,7 @@ static ir_entity *get_pic_symbol(be_main_env_t *env, ir_entity *entity)
 static int can_address_relative(ir_entity *entity)
 {
 	return get_entity_variability(entity) == variability_initialized
-		|| get_entity_visibility(entity) == visibility_local;
+		&& get_entity_visibility(entity) != visibility_external_allocated;
 }
 
 /** patches SymConsts to work in position independent code */