buildroot

toolchain: add hashes for all remaining external toolchains

Getting the hashes from upstream is not always possible:
  - Mentor's Sourcery: seems to require an account
  - TI's Arago: not able to locate the upstream.
  - Linaro: only signatures
  - Misc other toolchains.

So, all hashes were locally computed.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Peter Korsgaard <jacmet@uclibc.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>