[Cin] Attempt at fixing screencapture under NetBSD

[Andrew Randrianasulu]

Tried to record desktop, found out screencapture does not work :(

It seems even ffmpeg fall back to non-shm capture (slower) under
NetBSD, so I tried to
to change logic in guicast/bccapture.C so if compiled on netBSD it
hard disable shm for capture (playback is fine)

Please try on Linux and other systems ... Pay attention to
screencapture slowdowns!
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