Update GetEyePose to GetHmdPosePerEye for 0.4.3

The Oculus SDK library version 0.4.3 provides GetHmdPosePerEye() instead
of GetEyePose().
Add linux 0.4.3 build

Built from official 0.4.3 download.  In LibOVR/Makefile added libs to
SHARED_TARGET so it looks like this:
   $(OBJECTS) -lXrandr -lGL -lrt -lc

This adds the needed shared library dependencies for things like python
that load the .so.
  To see the dependency list, use: ldd libovr.so.0.1.1