Since both audio and video capture devices declare the KSCATEGORY_CAPTURE interface,
plugging a camera that supports both could result in an audio device being mistaken
for a video one.
https://bugzilla.gnome.org/show_bug.cgi?id=796958
strcasecmp is not defined on MSVC, so just use the glib wrapper. Also pretend to
be Windows XP explicitly since the API we use was deprecated and removed
(ifdef-ed) from the SDK after this version of Windows. This will be especially
relevant once we stop supporting Windows XP soon:
https://bugzilla.gnome.org/show_bug.cgi?id=756866
gst_ks_device_provider_probe() is a no-braier, just runs ks_enumerate_devices()
and reports the results.
Monitoring is a bit more tricky. We have to create a dummy message-processing
window and register device change notifications for it.
As kernel streaming can (and should) be used for audio capture and audio
playback, this change also has certain placeholders for such.
https://bugzilla.gnome.org/show_bug.cgi?id=747757
