* It is a *HACK*
* Avoid "Mount /cust (Device or resource busy) failed" error on orangefox which
mounting /cust as /vendor and also runing a non-treble ROM.
* It is a Orangefox feature that mount both /vendor and /cust while runing a
non-treble ROM (Obviously, there is a BUG that it shouldnt mount both but /cust
only), so both of them have a same block. In this case, normal busybox unmount
will only un-mount what we inputted. I guess that orangefox hacked umount command
to make /cust is binding with /vendor.
(See comments in #41)
Signed-off-by: wloot <wlootlxt123@gmail.com>