build: explicitely requires standard math library.
Update NEWS file.
Post-release version bump.
gv_interface: use 255.255.255.255 as broadcast address for device discovery.

Some cameras don't respond to discovery packets if the destination is not
255.255.255.255.
gv_interface: fix crash when non INET interface available.

Fix https://bugzilla.gnome.org/show_bug.cgi?id=710606
camera: don't apply workarounds in arv_camera_new

It breaks users who construct camera objects using g_object_new,
which includes but is not limited to introspection users. Move
use_gain_raw to arv_camera_constructor

https://bugzilla.gnome.org/show_bug.cgi?id=711192