gqrx : Add RDEPENDS to pick Qt svg image support plugin.

Needed for the gqrx icons.

Signed-off-by: Philip Balister <philip@balister.org>
gnuradio : Turn off orc.

There are issues with orc and hard float builds. Just use the NEON
routines instead.

Signed-off-by: Philip Balister <philip@balister.org>