Created by: semihalf-kardach-stanislaw
Add elftoolchain compiled for RISC-V using cross-compilation toolchain on Ubuntu 20.04: riscv64-linux-gnu-gcc (Ubuntu 9.4.0-1ubuntu1~20.04) 9.4.0 Additionally describe procedure for native and cross compilation of said libraries.
Issue: #3544
Signed-off-by: Stanislaw Kardach kda@semihalf.com