When looping through a package's STAGING_FILES_LIST (a list of
file/directory paths delimited by newlines), if the path contains
spaces, then the path will be split by the while loops, and the
file/directory will not be deleted/removed.

This sets the internal field separator to the newline only so that the
entire path is considered when deleting/removing.

Signed-off-by: Jeffery To <jeffery.to@gmail.com>