This patch replaces 'ln' in the post script of the toybox-full package
with 'toybox-full ln'. This is because the ln command is availabe after
the toybox-symlinks-full package is installed.
Change-Id: I509e97f71b5b8e2098c23b41329d51ab065df8df Signed-off-by: Wook Song <wook16.song@samsung.com>