Build-gnuradio script

I’ve put together a script for building GnuRadio+UHD for both Ubuntu
recent and Fedora recent.

I’ve attached it.

This is outgrowth of a script I put together and distributed to a few
people several years ago, but it has
been updated quite a bit and supports both Ubuntu and Fedora.

Your mileage may vary. Void where prohibited. Some settling may have
occurred during transit. Batteries not
included. Only use while awake. Do not use in the bathtub.