gnuradio : Change SRC_URI to fetch from github.

Signed-off-by: Philip Balister <philip@opensdr.com>
gnuradio : Add unversioned .so files to gnuradio-dev package.

The gnuradio-dev package needs to RDEPEND on each libgnuradio-foo-dev
package.

Signed-off-by: Philip Balister <philip@opensdr.com>