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This solves quite a few issues on my Nexus One, notably inside MKVs

- Detect leading digits of NDK version
    (Versions prior to 7 didn't have a RELEAST.TXT file)
- Don't automatically update existing vlc checkout
    Abort if the checkout does not contain the tested commit
    Give destructive instructions for update

Error mode broke any version not NDKr7

TODO: --enable-thumb for ffmpeg

Move enabling of audiotrack where required

Feel free to revert if it breaks on your device.
http://developer.android.com/guide/topics/graphics/hardware-accel.html

This overrides the color set by the theme (like the ugly gradient in
ICS).