task-boot: use DISTRO_UPDATE_ALTERNATIVES instead of update-alternatives directly
task-boot: use DISTRO_UPDATE_ALTERNATIVES instead of update-alternatives directly

* Images built after 2009-12-08 9b641bbfed07c075ae5cbe84082a85f1ba703447
  probably use opkg-native, but also ship with u-a-cworth

Signed-off-by: Martin Jansa <516df3ff67e1fa5d153800b15fb204c0a1a389dc@gmail.com>

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