Add Arm NN include in build-tool output

* Usability improvement

Signed-off-by: James Conroy <james.conroy@arm.com>
Change-Id: I973e2c29e5974db9f2da04e39b549ecb1b12cb48
diff --git a/build-tool/scripts/build-armnn.sh b/build-tool/scripts/build-armnn.sh
index af66341..865b16f 100755
--- a/build-tool/scripts/build-armnn.sh
+++ b/build-tool/scripts/build-armnn.sh
@@ -126,6 +126,11 @@
     ln -s libprotobuf.so.23.0.0 ./libprotobuf.so
   fi
 
+  # Copy Arm NN include directory into build output
+  cd "$ARMNN_BUILD_TARGET"
+  rm -rf include
+  cp -r "$SOURCE_DIR"/armnn/include .
+
   echo -e "\n***** Built Arm NN for $TARGET_ARCH *****"
 
   local tarball_path="$ROOT_DIR/armnn_$ARMNN_BUILD_DIR_NAME.tar.gz"