Use Reed-Solomon code from GNU Radio 3.9

[daniestevez]

An earlier attempt at this is in the gr-fec-rs branch. Since then, the Reed-Solomon blocks in gr-satellites have been refactored. This enhancement will help us remove the code taken from Phil Karn's libfec from gr-satellites. Once this is done, the Debian copyright information needs to be updated.

[daniestevez]

I've just pushed a new branch gr-fec-rs-3.9, but this doesn't work with GNU Radio 3.9 due to gnuradio/gnuradio#4454