IVGCVSW-4482 Remove boost::ignore_unused

!referencetests:229377

Signed-off-by: Jan Eilers <jan.eilers@arm.com>
Change-Id: Ia9b360b4a057fe7bbce5b268092627c09a0dba82
diff --git a/src/backends/backendsCommon/test/layerTests/MeanTestImpl.hpp b/src/backends/backendsCommon/test/layerTests/MeanTestImpl.hpp
index b8eae1c..cd7b22e 100644
--- a/src/backends/backendsCommon/test/layerTests/MeanTestImpl.hpp
+++ b/src/backends/backendsCommon/test/layerTests/MeanTestImpl.hpp
@@ -28,7 +28,7 @@
         float scale = 1.0f,
         int32_t offset = 0)
 {
-    boost::ignore_unused(memoryManager);
+    IgnoreUnused(memoryManager);
 
     armnn::TensorInfo inputTensorInfo(InputDim, inputShape, ArmnnType);
     armnn::TensorInfo outputTensorInfo(OutputDim, outputShape, ArmnnType);