IVGCVSW-2022 : fix for backend cmake files to respect BUILD_UNIT_TESTS variable

Change-Id: I8d34419742152edd50f1ec438e32d3ccc4f38351
diff --git a/src/backends/aclCommon/CMakeLists.txt b/src/backends/aclCommon/CMakeLists.txt
index 2bfd024..9282e10 100644
--- a/src/backends/aclCommon/CMakeLists.txt
+++ b/src/backends/aclCommon/CMakeLists.txt
@@ -23,7 +23,9 @@
     memory/PoolManager.hpp
 )
 
-add_subdirectory(test)
+if(BUILD_UNIT_TESTS)
+    add_subdirectory(test)
+endif()
 
 add_library(armnnAclCommon OBJECT ${armnnAclCommon_sources})
 target_include_directories(armnnAclCommon PRIVATE ${PROJECT_SOURCE_DIR}/src)