Raspberrypi fixes for OpenNi2#9

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hcw70 wants to merge 4 commits intoOpenNI:masterfrom

hcw70:raspberrypi-fixes

Commits on Jan 30, 2013

Fix platfom include bugs
Hauke Wintjen
committed
Added Armv6l as new target platform and created missing OniPlatformLinux-Arm.h header
Hauke Wintjen
committed
XnLinuxUSBDevice is unused in source, and fails to compile if arm is enabled. Quick fix is to disable file completely
Hauke Wintjen
committed

Commits on Feb 1, 2013

Merge branch 'master' of https://github.com/OpenNI/OpenNI2 into raspberrypi-fixes
Hauke Wintjen
committed