The media player buttons weren't working. At runtime there were warnings
like:
(gtk-play:824): Gtk-WARNING **: 12:37:53.946: Could not find signal handler 'next_button_clicked_cb'. Did you compile with -rdynamic?
Add the missing linker option to make the buttons work.
[YOCTO #15915]
(From OE-Core rev: 5571061e26a98804670b0d39b86f3b3b205061b1)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>