gles/es3.1: Enable dispatch of almost all new GLES 3.1 functions

gles/es3.1: Enable dispatch of almost all new GLES 3.1 functions

A couple functions are missing because there are no implementations of
them yet.  These are:

      glFramebufferParameteri (from GL_ARB_framebuffer_no_attachments)
      glGetFramebufferParameteriv (from GL_ARB_framebuffer_no_attachments)
      glMemoryBarrierByRegion

v2: Rebase on updated dispatch_sanity.cpp test.

v3: Add support for glDraw{Arrays,Elements}Indirect in vbo_exec_array.c.
The updated dispatch_sanity.cpp test discovered this omission.

v4: Rebase on glapi changes.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>