IVGCVSW-6707 Enables a bare metal compile

Change-Id: Icc2f83c5f27f413758fee3e5c1445e9fc44f42c8
Signed-off-by: Jim Flynn <jim.flynn@arm.com>
diff --git a/src/armnnUtils/Filesystem.cpp b/src/armnnUtils/Filesystem.cpp
index 1f636d8..d917e50 100644
--- a/src/armnnUtils/Filesystem.cpp
+++ b/src/armnnUtils/Filesystem.cpp
@@ -2,6 +2,7 @@
 // Copyright © 2020 Arm Ltd and Contributors. All rights reserved.
 // SPDX-License-Identifier: MIT
 //
+#if !defined(ARMNN_DISABLE_FILESYSTEM)
 
 #include <armnnUtils/Filesystem.hpp>
 
@@ -31,5 +32,7 @@
     return namedTempFile;
 }
 
-}
-}
+} // namespace armnnUtils
+} // namespace Filesystem
+
+#endif // !defined(ARMNN_DISABLE_FILESYSTEM)