Add missing pragma

Change-Id: Id06ac0741d626cceaafa79f592f3ed9e69136464
Signed-off-by: Dunajski, Bartosz <bartosz.dunajski@intel.com>

Author: BartoszDunajski

core/helpers/pipeline_select_args.h

@@ -5,6 +5,8 @@
  *
  */
 
+#pragma once
+
 namespace NEO {
 struct PipelineSelectArgs {
     bool specialPipelineSelectMode = false;