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/CpuTensorHandle.cpp b/src/backends/backendsCommon/CpuTensorHandle.cpp
index de83048..65e6c47 100644
--- a/src/backends/backendsCommon/CpuTensorHandle.cpp
+++ b/src/backends/backendsCommon/CpuTensorHandle.cpp
@@ -3,6 +3,7 @@
 // SPDX-License-Identifier: MIT
 //
 #include <armnn/Exceptions.hpp>
+#include <armnn/utility/IgnoreUnused.hpp>
 
 #include <backendsCommon/CpuTensorHandle.hpp>