Specify delimiter for xargs used in uninstallation script

In default, xargs uses blanks to split input data.

But there is a path including space in `build/install_manifest.txt`, it
will cause xargs generate wrong command lines.

Therefore, we have to specify delimiter for xargs.

uninstall.sh

@@ -5,7 +5,7 @@
 
 if [ -f build/install_manifest.txt ]; then
    echo "Uninstallation file exists..."
-   sudo xargs rm < build/install_manifest.txt
+   sudo xargs -d '\n' rm < build/install_manifest.txt
 else
    echo "Uninstallation file does not exist."
 fi