RTEMS 5 tool chain update

[Sebastian Huber]

Hello,

I updated the tool chain (RSB) to use the latest Newlib snapshot 
(3.0.0.20180720) and Binutils 2.31.1. An immediate update from the 
previous tools based on Newlib 3.0.0 is not necessary.

I merged the RISC-V tool targets riscv32-rtems5 and riscv64-rtems5 into 
a common riscv-rtems5 target. On RISC-V only the latest GCC 9 
development version is used.

-- 
Sebastian Huber, embedded brains GmbH

Address : Dornierstr. 4, D-82178 Puchheim, Germany
Phone   : +49 89 189 47 41-16
Fax     : +49 89 189 47 41-09
E-Mail  : sebastian.huber at embedded-brains.de
PGP     : Public key available on request.

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