openscenegraph-git: Update to latest from git. Fix dependencies.
mingw-w64-arm-none-eabi-binutils: Added
mingw-w64-arm-none-eabi-newlib: Added
mingw-w64-arm-none-eabi-gcc: Added
mingw-w64-arm-none-eabi-gdb: Added
arm-none-eabi-newlib: Untar gcc-arm-embedded.tar.bz2 quietly

Also remove {gcc,newlib} folders before re-extracting and add
!emptydirs option.
Untar gcc-arm-embedded.tar.bz2 quietly

Also remove gcc folder before re-extracting and add
!emptydirs option
ogre3d-hg: Update to latest.
poco: New package. WIP
Merge remote-tracking branch 'upstream/master'