IVGCVSW-2000: (Fix) Backend-specific unit tests not being executed

 * Also disabled the Compute_ArmComputeCl/L2Normalization1dNhwc test as it
   fails due to a bug in ACL

Change-Id: If1e36bc04f606e6568e6a13cc77f8f51f5834997
diff --git a/src/backends/neon/test/CMakeLists.txt b/src/backends/neon/test/CMakeLists.txt
index 82156f3..87da01e 100644
--- a/src/backends/neon/test/CMakeLists.txt
+++ b/src/backends/neon/test/CMakeLists.txt
@@ -9,7 +9,7 @@
     NeonLayerTests.cpp
 )
 
-add_library(armnnNeonBackendUnitTests STATIC ${armnnNeonBackendUnitTests_sources})
+add_library(armnnNeonBackendUnitTests OBJECT ${armnnNeonBackendUnitTests_sources})
 target_include_directories(armnnNeonBackendUnitTests PRIVATE ${PROJECT_SOURCE_DIR}/src)
 target_include_directories(armnnNeonBackendUnitTests PRIVATE ${PROJECT_SOURCE_DIR}/src/armnn)
 target_include_directories(armnnNeonBackendUnitTests PRIVATE ${PROJECT_SOURCE_DIR}/src/armnnUtils)
\ No newline at end of file