Move the handling of divisor into the vao helper. Also deal with
matrices there. On my aplpe (which lacks vao support) these have
to be manually bound so having the falback code in the VAO helper
handle it.  On some systems that have VAO extensions and instanced
array extensions the VAO extension does not handle the instanced
aray extension.  So we force emulation of VAOs when glyphing
triangles which is where the use of instance arrays can hit.

Change-Id: Idc68e47c8743b2772a4a0e63621eceb1f778c5a3