buildroot

bash: bump to 4.4.12

In addition, remove upstreamed patches and add a hash for the license
file.

Signed-off-by: Adam Duskett <aduskett@gmail.com>
[Thomas: indicate pgp signature file address in hash file, as
suggested by Baruch.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>